a few points...
1. As i have read it, and understand it, universal has the rights to the characters they have developed attractions for. This is clearly the hulk, spider-man, dr. Doom, storm. Less clear would be extracting that to include the fantastic four and x-men. If this is true, then thor, capt. America, and iron man are all up for grabs, and could very easily be used in a variety of ways at disney.
2. Why would disney want marvel on property? Simply put, to entertain the teenage boys and young men staying on vacation. I think the inclusion of some marvel properties would make the prospect of vacationing at disney much more attractive, and also might save parents from having to drive over to universal to see them.
3. Those who just seem dead set against seeing the characters in the parks are, imho, just a bunch of curmudgeons. Disney has been acquiring, creating, and displaying disparate properties since the beginning, heck the frito bandito was in disneyland from the start. While spider-man isn't everyone's cup of tea, neither is phineas and ferb, or aerosmith, or star wars, and yet they all live in hollywood studios, quite happily together. I don't want to see wolverine become the new stitch, but that's true of any character, disney owned or not. I think the vocal nay-sayers just need to back off a bit and let the marvel fans enjoy the prospect of seeing properties they do love, introduced in an appropriate manner.
Now, with that out of the way... Here are my proposals.
Main street usa- now featuring capt. America meet and greet
stark enterprise's presents: Tomorrow land
new world show case country, latveria, with dr. Doom themed e-ticket ride
new world show case country, wakanda, with vibranium mine cart ride
wonders of life reopens with a genetic retheme and focus on the x-men
new continent in animal kingdom- the savage lands, replaces that pile of crap about dinosaurs now there.
Streets of america becomes a non-stop fight zone between spider-man, daredevil, punisher, the thing and the sinister six.
Just some thoughts