I don't believe there's anything at all in the contract about actually EXPANDING Superhero Island. The contract is only for its initial instruction. Any new addition would entail starting from scratch with a new contract.
I imagine this is exactly the way the Star Tours contract is written and why there hasn't been an expansion of Star Wars. Disney may have exclusive rights to SW, but they don't have any right to build anything besides the original attraction. Disney is probably waiting Lucas out (knowing that he can't go anywhere else with his characters) so it'll eventually be in his best interest to accept whatever deal Disney offers him to expand.
As others have stated, eventually Uni will tire of having an outdated Island on its property. Hopefully TF4 will be a major success and they'll decide they'd rather have TF than Marvel.
Still, the other side of the coin is that Uni would be allowing their competitor to add to their arsenal. I hate to say it, but we could end up one day with only one minor attraction at Uni based on the Marvel characters, just so WDW can't have the rights.
Even if they don't see Marvel as a major draw at their parks in the future, they won't want to see them in WDW. I don't see any amount of money that Disney could offer them that would be worth the amount of guests that they could lose to WDW.
I imagine this is exactly the way the Star Tours contract is written and why there hasn't been an expansion of Star Wars. Disney may have exclusive rights to SW, but they don't have any right to build anything besides the original attraction. Disney is probably waiting Lucas out (knowing that he can't go anywhere else with his characters) so it'll eventually be in his best interest to accept whatever deal Disney offers him to expand.
As others have stated, eventually Uni will tire of having an outdated Island on its property. Hopefully TF4 will be a major success and they'll decide they'd rather have TF than Marvel.
Still, the other side of the coin is that Uni would be allowing their competitor to add to their arsenal. I hate to say it, but we could end up one day with only one minor attraction at Uni based on the Marvel characters, just so WDW can't have the rights.
Even if they don't see Marvel as a major draw at their parks in the future, they won't want to see them in WDW. I don't see any amount of money that Disney could offer them that would be worth the amount of guests that they could lose to WDW.