Part of what makes the EPCOT issue so perplexing, as well, is that we have here a park with only about three attractions (currently) that draw anything resembling a significant wait time, yet it still ranks as the third most visited theme park in America and top five or six on planet Earth. Beyond that, there's clearly a dedicated fan base for the original EPCOT Center theming and attractions, yet not many who are going out of their way to shout their love for the current park; clearly, somebody at corporate knows this, evidenced by the continuing sale of retro EPCOT apparel even years on past the 30th anniversary.
It seems to me this implies that there is an audience out there if the original EPCOT concept could be designed and promoted well, and that it wouldn't take much for EPCOT's numbers to be impressive given that, again, it's highly ranked among all theme parks despite only ever having a significant waiting time at Test Track, Soarin', and now Frozen. Going whole hog and gutting the entire pavilion concept comes off like tossing out the baby with the bathwater, but I suppose the shareholders want to hear there's movement with Marvel properties and they want to hear it yesterday.
I do still believe that it's foolhardy to try to replicate the Potter experience with most properties; might be an interesting topic of conversation, to figure out what makes a property like HP work so well for theme design and why others might not have the same level of staying power or expansive opportunities. I think Disney's best bet if they want to get close to HP is Star Wars, but I'm not so sure about a lot of other possible ones.