I find the villains often the most interesting part of their respective films. They are also often the characters with the most "life" to them. And we wouldn't exactly have the Disney movies if they didn't exist. No, they don't win, but that doesn't mean I don't like seeing them. And I'm not sure a mash up of them would cause a weaker experience. I don't see that with Fantasmic for certain. (Yes, that show has problems, but I consider the "story" pretty solid). I don't see why having them all in one attraction in that Villain Mountain type concept with one of our favorite heros battling them couldn't be great.