danlb_2000
Premium Member
Universal has a perpetual license to all of the Marvel characters currently in use, and as long as they continue to refresh and maintain the attractions they will be able to hang onto them for eternity.
Pretty much the only condition for keeping the license is: "Each THE MARVEL UNIVERSE shall be operated and maintained in a first class manner consistent with the highest standards of the theme park industry "
There is some debate as to whether this simply means keeping what they have now in good condition or if it implies upgrades.