Wow....kinda surprised this thread took off like it did.
Might as well toss in my 2 cents...
As for buying Uni out for the sole purpose of being able to use those characters in the Florida parks....not gonna happen. I've been told on numerous occasions that Disney has no intention of trying to change the contract with Uni (Which, as I've been told on more than one occasion by Disney people, does not have an end date.). Mainly because it doesn't make financial sense.
Why? Because at this point Universal has the upper hand in that particular situation. They don't need the money. Comcast is doing very well financially, and is already preparing to dump a substantial sum into the Florida resort in the next few years. They have no reason at all to sell those rights, and thus would set a very high price. (Like if someone wants to buy your favorite collectable. You love it, don't really want to sell it, so you slap an outrageous price on it just to end the process.)
Say Universal slaps a price tag of a billion on it. (That's probably a bit conservative, but just for example...) A billion for the rights, plus another two hundred million to pay for the re-theming of the land in IoA.
If Disney were insane enough to go for it, they would be in the hole by $1.2 billion before they even move one shovel of dirt to build their own attraction, which would likely run to another $200mil.
That's nearly a billion and a half just to build one ride in one park in WDW.
Can anyone make a reasonable case for why they would ever do that? Nope. That's because there is no way to make that work financially. Even if Iger was the type to try that sort of thing, which he isn't, the board would laugh at him and likely throw stuff in his direction. Not to mention what Wall Street would say. It's a laughable idea at best.
Would they like to be able to build a Marvel ride at WDW? Sure. The creative possibilities are endless and it would be a great selling/bragging point. But it simply isn't worth it. Not when they are already the most visited resort in the world. Might Uni get a few thousand more guests this summer because of Avengers? Yeah. Will it be enough to put Disney into a panic mode? Nope.
(Side note: Why is it that the same people that say Disney has nothing to fear from the Potter-effect, also feel that now that Avengers is a hit Disney HAS to get them in the Florida parks. If Potter didn't hurt Disney, why would Avengers? Just wondering...)
Anyhow, Disney doesn't need the Marvel characters in WDW and Universal doesn't need the money from a sale. The status quo is working for both parties. The only place the sort of debate in this thread is taking place is among fans, not in meeting rooms in Orlando and California.