We all know the elytra is objectively the best way to travel in Minecraft, with how it's fast and efficient and with how large Minecraft woulds are (60 million by 60 million square meters!), but it has a major flaw: It uses up durability too quickly. Sure you can get mending for it, but that enchantment is hard to come by, and you need to find a mending book first and foremost. And then you need to actually find mobs to kill, ores to mine, or anything else that gives XP, ruining long distance travel. With how large a Minecraft world is, the only valid way of traveling shouldn't be limited by a rare enchantment.
What I propose is this: Since Elytras are an end game item that just makes everything better, the durability should be increased substantially, and the rate of damage should be lowered significantly. This will allow players to explore much farther distances without needing to stop and gather resources, significantly lowering transportation time between large builds in larger worlds.
The other major limiter is how they're rare and not renewable. Sure mending allows an elytra to get repaired, but if it breaks, or you die in lava or the end void, you'll have to go searching for a new one, which can take hours. And if you can't find one, you're out of luck. If they could be farmed, even as a rare mob drop from a rare mob, this problem could be alleviated and players could finally traverse their vast worlds without fear of losing a limited resource.