You also have to focus on the bottom half of the park however if the park is going to see it's full potential:
5. Move all essential buildings for daily operations ASAP. Once everything is moved, Demolish everything from Indiana Jones on back, Sounds Dangerous/Frozen building, Jedi Training stage and ST outdoors queue.
6. Starting at about Hollywood & Dine, the area would start to turn into more of a Caribbean/Adventure feel. Once you pass where H&D is, you would stumble upon Pirates of the Caribbean: Battle for the Sunken Treasure. The show building for this would be located in the parking lot, but the entrance to the ride would be roughly where Indiana Jones is now. The queue would be similar to Space Mountain as far as the long walk to get to the ride. I think two Pirates rides can co-exist as the ride and the films are very different. This would also allow the original pirates to revert to it's original form, sans Jack Sparrow.
7. To the right of the entrance to Pirates would be an Indiana Jones mini-land. Since Pirates was put all the way back into the parking lot, there's a lot of room to play with still. There would be two main attractions: an updated version of Indiana Jones and the Temple of Peril and an all new, state-of-the-art Indy ride (not IJA). Backlot Express would be turned into something similar to Jock Lindsey's to complete the Indy area. To finish off this adventure area, a clone of Tokyo DisneySea's Journey to the Center of the Earth would be put in place
8. If Star Tours would escape demolition, a change of theme to The Muppets would be ideal. You don't want to put a big IP in an ancient ride system and Muppets are right next door. Muppets also have so much content to choose from that they could easily randomize sequences just like ST2.
Since this would be built on backstage land and currently used attraction space, the park lost two shows (IJ and Frozen sing-a-long), but gained 4 rides, bringing my theoretical park total up to 16 now, while the number of shows drops to 5. I can't even imagine how many Billions it would take to accomplish this knowing how Disney spends money though. And even then there's upgrades to be made. Fantasmic! and BatB for example.