Not to belabor this, but the contract CLEARLY and PLAINLY says that any future new Marvel attractions will require Marvel's approval.
Whenever Marvel has “reasonable” rights for rejection of approval hereunder, the basic criteria to be used by Marvel may include inconsistency with (i) basic story line, (ii) the powers, (iii) basic personality traits, (iv) physical appearance (including clothing or costume), and/or (v) living habitat or environment relating to such character as portrayed in Marvel’s exploitation of such character in comic books or other products for the particular time period being depicted by MCA.
Ya think Disney is going to approve some awesome Avengers ride? They will have reason after reason that it doesn't follow theming or story, which will drive the price higher and higher and stretch the timeline out longer and longer. Yes, Universal can fight any of this but it all goes to arbitration EVENTUALLY and there are many clauses Disney could argue that Universal has not followed to the letter. And if Disney wins that arbitration, Universal loses the license. Ya think Universal wants to chance that?
Marvel Super Hero Island WILL NOT CHANGE without Disney's approval. Period. End of story. Now move on...