And while a fair point, perhaps it would be best to keep in mind how the deal originally was back before TSR opened, and when it was most likely modified in 2011-2012 and then in 2013-2014 for the respected Orlando and Hollywood Springfield's, and that I would assume some change has been made that has extended the timeframe of Springfield's stay to the late 2020's.
Honestly? I would look at the Marvel contract, and come up with some rational thoughts. From what it seems like, Universal has the ability to add to MSHI, as long as they get the consent and approval from Marvel Entertainment (not sure about Disney).