Now, I'm being hypothetical here. But what if, and what if here, the current people of the Marvel theme park rights for Florida were eying up buying another studio that has two of the three most iconic Superheroes of all time, and could replace Marvel with them at their theme parks, and Disney could get full reign of the Marvel rights.
(No this isn't a hint for the Uni side of things! I just think it's a fun idea to spitball!)
Anyways outside of the Strange rumor, I think some other ideas I've heard for this are Big, but I hope Disney looks in it's Heart to make sure they have a plan to have original trilogy presence maintained following the closure of Star Tours.
These are all very blue-sky ideas right now so, like, who knows what they'll settle on, but they seem relatively intent on keeping the ride system.