Obviously I am the minority here and I know its inevitable no matter what I think...but I think bringing Marvel to the parks would totally ruin WDW. The Marvel section in Universal was great because there they can do pretty much what ever they want, there isn't really a 'theme' to Universal or Islands.
I mean lets face it, yes if there are super hero attractions at WDW every little boy is going to beg his parents until they give in, bringing more revenue. But can you imagine waiting for a meet and greet with Mickey, a soft lovable character then turning around and seeing Iron Man, a metal clad vigilante? Or the Punisher who would be wearing what, a ripped up t-shirt with a skull on it and carrying a huge machine gun?
I just don't see Marvel's place in WDW, at least at this time. Maybe if Disney opened another park, not a 5th gate in WDW but a totally separate park (maybe not even in Orlando). They could do it with Marvel rides/characters and some of Disney's more 'thrill' movies...
Dont get me wrong, I love Marvel and I love WDW but I just don't see them coexisting under the same roof, so to speak.