Villains, bad idea.
Marvel good?
Your "demographics" contradict each other.
Disney villains are way less scary than many of Marvels. I understand it will be a while before Disney does anything with Marvel, especially in the parks, however, you said Marvel would would attract "x" type of people, would Villains and thrill rides not attract that, plus more than just these fan boys?
Besides, I wouldnt, and I really doubt Iger would do it, or any of the board members approve of such an idea, it was more or less a joke I was making. "A la Universal".....Who had Marvel first?