Reading the thread about Spider-Man at DCA, I think that Disney probably think of this contract being in perpetuity as a blessing. the die hard Disney fans want Marvel at WDW but Disney have an easy defense which in a twisted way (depending on how you look at it) make Disney seem like the good guys and Universal, the bad guys.
It's one thing to build a Marvel land on the west coast or any where else in the world but to build one in Orlando sounds like a complete nightmare. MSHI has Spider-man (IMO the GOAT) and Hulk, both of which are iconic and excellent rides. If Disney decided to build a Marvel land in Orlando, the comparisons are going to be there from day one and not only do they need to beat what Universal have created, they have to destroy it.
It's an impossible task with not that much return for the time and money that would need to be thrown at the project and as it stands, they're still making a killing off merchandise sales at IOA. Also, woith everything coming to WDW, they don't need anything else to add to the potential that they could already build, especially now with the Fox acquisition.
On a different subject, did anybody hear the story behind Stan Lee's cameo in Captain Marvel?