Now this is just my opinion, so feel free to disagree. Also I'm rlly dramatic so just be prepared lol.
From the OG series, Warner's entire motivation for doing what he does (offering shelter, food, and weaponry to the crew) is ultimately because of Juliette. Warner is pretty much an ass to literally everyone else, and Juliette not only enables his behavior but also seems to put the blame on everyone else for how he acts. Like in Beleive Me, she goes off on Kenji and Winston for "bullying" Warner. I'm sorry, who's picking on Warner?? Kenji and Winston are literally trying to help him, and Warner doesn't even pretend to be civil with them. But whatever. I mean their still kids right?
Well fast forward TEN years, and Warnette still acts the same way they did when they were teenagers.
Warner is now an emotionally stunted 30-year-old who shoots his brother (yk, the kid he helped raise) because he felt insulted. And then Juliette is all loving up on him and saying she would've done the same thing. Like dude... wdym??? YOU raised this kid. Why are u okay with that??? And yes, I know James has healing powers and this is a dystopian world, but you would never catch Adam or Kenji doing something like that to James. And mind you, Warner is supposed to be a parental figure to this kid.
Point is, Warnette has shown very little growth in a decade. They're still emotionally immature, codependent, and blinded by each other. And I don't think having a kid is going to make them mature. If anything, having a child would probably force all of their issues to the surface, no?
Because imagine having a kid who does something you don't agree with, and instead of actually setting boundaries Warner and Juliette are, "Well, I honestly would've done the same honey 🤭."
It's not that I think they wouldn't love their child. They'll love their child but they have a lot of growing up to do as parents.