1. Toy Story Mania remains.
2. This building houses The Great Movie Ride, so no real room beyond the meet and greet and gift shop they built in the side.
3. This is empty space. It could house your MI dark ride, or the MI coaster we have all been waiting for. But think about it, putting the two most recent and very popular attractions right next to eachother in an already crowded area would be bad planning. So as much as I'd like to put it there, I'd have to say they put a table service there, a meet and greet area, or an exhibit display. Theming for the table service is up in the air, but I'd say they make a Pixar Studios sort of theme with areas of the restaurant surrounding different art from the films. Meet and greet is self explanatory. Exhibit would be awesome in my opinion, as they could display the concept art and drawings of Pixar films with descriptions of the inception of each film.
4. Re-theme this quick service is something Pixar-ish (Wall-E's cafeteria, or something punny).
5. Re-theme this to Bug's Life (duh).
NOTE**6 and beyond are in the green area which means its possible land for use should they demo the backlot and/or the stunt show. Green area shows possible land, pink area shows attraction space they could utilize it in my eyes.
6/7. These spaces could house what wasn't done in step 3 (table service, meet and greet, Pixar exhibit) or one could house an attraction of choice (i.e. MI coaster or dark ride, whatever).
8. Instead of shoving a whole Carsland in the studios just put the Radiator Springs Racers here. I personally don't want it, so this space could also be utilized for a new and technologically advanced and imaginative attraction as well. Something like an Incredibles sim ride, or a Wall-E attraction, anything. The point here is to build an E-ticket.
9. Again what wasn't used in steps 3, 6, or 7 could be placed here. If those aren't necessary/wanted then a show could be installed I suppose, or it could house one huge gift shop to dump the E-ticket into afterwards.
Disclaimer is, I just thought all of this up in the past half hour while I was mapping it. I'm not saying this is exactly how it should be, but to me its a pretty good plan using the space available and, should they destroy those attractions, what they could do with the land. You asked what I'd do and this is something I thought up real quick.