I'm gonna be extremely upset when The Simpsons go, so I'm slowly preparing for the day Universal announces the closure of The Simpsons Ride/Springfield lol.
A part of me wishes they would revisit the BTTF coaster concept as a replacement, but I think all hope of classic IPs like BTTF and Jaws returning went out the window a long time ago.
Springfield/Simpsons Ride/Animal Actors stage and backstage areas take up a large amount of land, so Universal could create a pretty immersive/large land. Pokemon, DreamWorks, Illumination, etc. would work in that space.