See even if EU isn’t built till the late 20s/early 30s, I don’t think the hub would be the one undergoing major re-work, it’s the lands and the marketability of those lands that will likely need major work. And if they can’t move HTTYD to another spot, does that lose its place? Or does the IP prove to be timeless like Monsters? We’ll have to see.
Sadly while it likely means a super long wait, Monsters should stay here. Fits the best, get that tech right for a Creature boat ride once they begin working on it again, and open both up together to open the land.