I say leave Tower of Terror alone since it is next to the Hyperion... I'd hate to see the "old Hollywood" vibe that ToT & Hyperion has be removed. The way I would like to see them change up this side of the park is....
- move "Turtle Talk with Crush" to Paradise Pier (or Pacific Wharf)
- Replace Disney Junior Live with something else (Disney Junior is terrible in general, not just this "show" which has creepy puppets lol)
- Replace Anna/Elsa meet-n-greet with Mickey/Minnie/Goofy/Pluto/Donald Hollywood award show attire (they're probably relocating back to Fantasyland at some point)
- Keep ToT, Hyperion (Frozen), & Red Car Trolley, Sorcerer's Workshop/Animation Academy (don't fix what isn't broken)
Now as for the area that Monsters Inc, Muppet Theatre & the soundstages are located, I say turn THAT into a mini Marvel Land. It already has entrance archways for signage. If they demolished the soundstages & Muppet Theatre, it'd really give them quite a bit of space to work with.
- Marvel themed coaster (as rumored)
- Themed meet-n-greet areas (Captain America & Spiderman are already in Hollywood Land, Thor needs to be brought back ....from Asgard)
- Monsters Inc could be gutted & replaced with a Marvel themed dark ride (as rumored)
- A nightly "Awesome Mixtape Party with DJ Starlord" (Electronica/Mad T Party were popular)
- Depending on execution & use of space, they could have a new Marvel themed dining restaurant (MARVEL MANIA ANYONE?
) or even another ride/attraction