So let's say they do build this and it's essentially just FoP - Avengers version. This would present them with an option that I think Chapek would absolutely love. Grizzly Peak is a land with two *original* attractions, something that i'm sure Chapek would love to change. By adding FoP, this would allow them to basically do whatever they want with that land. Add whatever new IP themed land they want and while people would still groan about losing Soarin', the groans would be less because there's a NEW Marvel version!
Not saying that's something that's even in the cards for the near future, but I can totally see it happening considering how Chapek loves to squeeze IP into every little nook of the parks.