Disney and Marvel is kind of like Soda Pop and Tomato Juice; I like them both, but I would probably puke if someone tried to mix them together and serve them to me. :hurl:
One, possibly two, well done attractions in DHS, along the lines of the Narnia Attraction, or Star Tours, may be alright. But otherwise, Marvel characters have absolutely NO place in WDW. None. Period. I dread the day that I walk into the Magic Kingdom and see the Hulk signing autographs.
My best case scenario is that Universal is willing to keep the characters, and that Disney is willing to let them. Universal pays Disney licensing fees to use the Marvel Characters. Disney remains Disney and Marvel stays at Universal where it belongs and I can enjoy both places. Trying to integrate Marvel into WDW would be like mixing Soda and Tomato Juice.