While I realize Epcot isn't going back to what it was in 1990 or so, I'm disturbed at the loss of coherence. Even the character invasion doesn't have to lose the coherence of theme. Characters in World Showcase, used correctly, enhance the understand of the nations depicted by reminding us of the stories that come from those countries. Disney, of course, hasn't always used characters correctly to that end (Morocco is not in Arabia, so is Aladdin doing there, for example), but it can be done. Even adding Nemo to Seas, IMHO, worked fine. Finding Nemo was set in the real world, and the characters provide a nice way of bringing kids into the pavilion.
Frozen in Norway, of course, stretched the limits of any coherent theme. But GotG in Epcot seems to break not just the theme of Future World (which I always thought of showing how learning about our world and our past leads us into the future), but the entire theme of Epcot as a park grounded in the real world.
MK is the world of Fantasy and Adventure (Hall of President's doesn't belong, but I digress); DHS is the world of entertainment; Animal Kingdom is the world of animals and nature; and Epcot is our world -- the world of people.
Ok, rant over.
If the attractions are good, I'll go on them repeatedly and enjoy them, as I suspect I will with FEA. But I think it's highly unlikely that I'll ever be content or satisfied with their placement in Future World. Perhaps Disney will find a way to integrate them that I like. But I doubt it.