There maybe some truth also to what one was exposed to when first visiting Disney. While my kids grew up going to Disney (I did not) they were also exposed to other "magical" vacations and via modern technology they were also exposed to other entertainment. They want a good attraction/ride, they could care less who's IP it is, whether or not it "fits" where it is or what the original intent of the space was for.
Now my family doesn't have this longing for the past primarily because when we started going those thing were either gone or tremendously old and outdated, we can argue the why and why not's all day but I would hazard many of today's guest don't see the "history" behind figment, they see a place where they can cool off for 3 minutes.
I think they would be foolish to change the Epcot name, lol I've got some folks floating around my office that still call HS, Disney-MGM