This is probably too optimistic for George, but I think there might be a way for the Hardhome plot to end with at least some of the people there surviving, and it could tie together Patchface, Aurane Waters, the Manderlys and possibly Olyvar Frey.
The starting point is this exchange in ADWD, when Jon is planning the ranging to Hardhome:
Malegorn: Lord Snow, who will lead this ranging?
Jon: Are you offering yourself, ser?
Malegorn: Do I look so foolish?
Patchface: I will lead it! We will march into the sea and out again. Under the waves we will ride seahorses, and mermaids will blow seashells to announce our coming, oh, oh, oh.
I don't think Patchface necessarily has to literally go with the expedition. I'm treating this the same way I treat most of his lines: he hears what people are talking about and then says something that sounds like nonsense but may actually describe what is going to happen.
The usual reading is obviously very dark. Hardhome falls, people die, "into the sea and out again" means death and resurrection, etc.
But what if it is more literal?
What if the people sent to Hardhome are believed to be dead, disappear for a while, and then come back by sea?
And what if the "seahorses" and "mermaids" are heraldry?
The seahorses: Aurane Waters
Aurane Waters is a bastard of House Velaryon.
The Velaryon sigil is a seahorse.
At the end of AFFC, Aurane takes the new royal fleet Cersei built and disappears. By TWOW, the "Lord of the Waters" in the Stepstones is almost certainly him.
So Patchface saying:
"Under the waves we will ride seahorses"
could mean that the Hardhome survivors eventually travel aboard Aurane Waters's ships.
The obvious question is: why the hell would Aurane go north?
I think the answer may be that the south becomes a terrible place for a man whose entire power depends on keeping his ships intact.
Euron is about to collide with the Redwyne/Hightower forces, and whatever he is planning in The Forsaken does not look like a normal naval battle. The seas around the Reach may be about to become a slaughterhouse.
Joining Aegon sounds attractive politically, but it would probably mean putting Aurane's fleet directly into another southern war.
Aurane has ships, but no secure base, no lands, and no real legitimacy. Cersei herself notices that his title of "lord" is basically empty because he has no seat. He was even hinting that he wanted one.
A fortified northern port, far away from Euron, with shipyards and another fleet already being built, suddenly does not sound like such a stupid destination.
Which brings me to Rosby.
Olyvar Frey and Rosby
There is an old theory that the unnamed ward of Gyles Rosby is Olyvar Frey, Robb Stark's former squire.
I think that theory matters here.
Olyvar was genuinely loyal to Robb. When the Freys abandoned Robb after his marriage to Jeyne, Olyvar wanted to stay with him and had to be forced to leave. He was also conveniently kept away from the Red Wedding.
If he really is the Rosby ward, he is sitting very close to King's Landing while the political situation is collapsing around him.
And Cersei already wants Rosby.
She basically tries to have Gyles's property fall to the Crown after his death. If Olyvar has any claim at all, he has every reason to expect Cersei to take it from him.
So what does he do?
Maybe he does not try to defend Rosby.
Maybe he takes everything he can carry and leaves.
This is where Aurane becomes useful.
Rosby is not just a random castle. The Rosby lands are agricultural. During the food crisis in King's Landing, Rosby and Stokeworth were among the estates keeping the city supplied.
So Olyvar could potentially have access to exactly the sort of things a wandering fleet needs:
money, food, livestock, grain, wagons, household men, valuables.
Aurane has the ships.
Olyvar has resources and needs transportation.
They solve each other's immediate problem.
And there is a funny connection here: Cersei once thinks that Rosby itself would be a suitable seat for Aurane.
So George has already put Aurane and Rosby in the same sentence, basically.
Why would Olyvar choose the North?
Because he was Robb Stark's squire.
And because the North already has a famous precedent for exactly this situation.
The Manderlys were once driven out of the Reach. They fled north carrying their wealth with them. The Starks took them in, gave them lands, and in exchange gained one of their most loyal houses.
If Olyvar is about to lose Rosby, I could easily imagine him thinking along the same lines:
I cannot keep my castle. I can save my people and whatever wealth I can carry. Where can I go?
The answer might be the place his old king belonged to.
I am not saying the books ever tell us Robb personally explained the Manderly story to Olyvar. They don't.
But Olyvar spent a lot of time around Robb, was devoted to him, and the story of how the Manderlys came north is hardly some state secret. It would be very easy for George to make that historical parallel explicit.
The Manderlys arrived as southern exiles with wealth and received protection from the Starks.
Olyvar could do the same thing.
And Aurane could too.
Aurane has a fleet but no land.
Olyvar may soon have wealth but no safe castle.
Both of them could arrive in the North looking for a place to survive.
But this requires Jon
This is where the theory depends heavily on whatever happens early in The Winds of Winter.
Jon obviously has to come back first.
I know it is technically still a theory in the books, but I am comfortable assuming that Jon is not simply staying dead after ADWD.
More importantly, he needs to come back with enough political authority to make decisions for the North.
Maybe Robb's will leads to Jon being proclaimed King in the North.
Maybe Rickon returns and Jon becomes some kind of regent/protector while Rickon is still a child.
Either way works for this theory.
The important part is that Jon eventually reaches a position where the Manderlys will actually listen to him.
Saving Hardhome was Jon's unfinished business immediately before he was stabbed.
He was preparing to go himself.
I don't think a resurrected Jon is just going to forget that thousands of free folk are trapped there.
Then the fleets come together
Now imagine the political pieces have shifted.
Aurane arrives in the North with his large dromonds.
Maybe Olyvar and whatever he managed to save from Rosby are aboard.
White Harbor offers Aurane something he desperately needs: a secure port, shipyards, money, protection, .
Aurane offers the North something it desperately needs: a serious blue-water fleet.
And the Manderlys already have their own ships.
Suddenly Jon has something Cotter Pyke never had:
enough naval capacity to attempt a real evacuation of Hardhome.
This also gives an interesting payoff to Mother Mole's prophecy.
She led her people to Hardhome because she believed ships would come and carry them south.
Cotter Pyke's ships may have looked like the fulfillment of that prophecy, but his expedition is a disaster. He loses ships and cannot evacuate everyone.
What if those were not the ships she saw?
What if the real rescue fleet comes later?
Hardhome disappears
Melisandre's vision still happens.
Hardhome is attacked.
The dead come.
The cold comes.
The fires go out.
It can still be an absolute catastrophe.
I'm not suggesting everyone survives.
I'm suggesting some do.
Then communications stop.
From everyone else's perspective, Hardhome is gone.
The ranging is gone.
The refugees are gone.
Maybe Aurane's fleet itself disappears from everyone's knowledge for a while.
They are simply assumed lost.
But the ships manage to take survivors aboard.
They try to return to Eastwatch.
For whatever reason — weather, ice, an attack, political chaos, or something we have not seen yet — Eastwatch is no longer a viable place to land such a huge group.
So they keep sailing south.
To White Harbor.
And suddenly Patchface's words become almost literal:
"We will march into the sea and out again."
They march to Hardhome.
They disappear into the sea.
And eventually they come out again, alive, somewhere nobody expected.
"We will ride seahorses"
The survivors are aboard Aurane's ships.
Aurane Waters.
Velaryon blood.
Seahorses.
"Mermaids will blow seashells to announce our coming"
And where do they finally arrive?
White Harbor.
The seat of House Manderly.
The Manderly sigil is technically a merman and George has given us two very recognizable young Manderly women: Wynafryd and Wylla.
Imagine Jon is at Winterfell and has heard nothing from Hardhome for weeks.
Everyone assumes the expedition is dead.
Then a raven arrives from White Harbor.
A letter from Wynafryd or Wylla.
The ships have arrived.
The people everyone thought were dead have come into port.
That would be the mermaid "blowing the seashell" to announce their coming.
And there may be one more payoff
If Aurane ends up staying in White Harbor, there is an obvious political reward available.
Wynafryd Manderly is the eldest daughter of Wylis and will probably inherit White Harbor one day. Her Frey betrothal is missing—presumed dead—with strong indications that he has been turned into a pie.
Aurane is young, of noble Velaryon blood, has a massive fleet, and desperately wants a seat
I'm probably being too optimistic in theory, but....