ok i have really strong feelings about what should happen here, only because there are so many better ways to make the experience better and instead people just want a million rides added when that isn't necessarily what is needed. yes, it should be made into a park about the thrills and making your day exciting, but i don't think putting in dark rides and coasters in places where they aren't needed is a smart idea.
what i think should happen:
Pixar Place expansion to
Radiator Springs Racers
le Chef Ratatouille
Monsters Inc Dark Ride [from California]
Crush's Coaster [from Paris]
An Incredibles Adventure (3D/4D show)
Buy N Large Cafeteria Snack Stop
A Bug's Life Set Play Area
Pixar Meet and Greet
Animation Courtyard Addition/Changes
The World of Disney - a breakthrough ride experience that mixes calssic dark ride, 360 degree view, and 3D screening in order to immerse you into the worlds of your favorite Disney movies.
create a new area of the park designed for Sci-Fi movies, which would include Star Wars and possibly a bulk for Tron and some minor other sci-fi ish movies.
make the whole area with LMA and Muppetts all about actual studio backlot stuff so
Muppet Vision 3D
Lights Motors Action
Studio Backlot Tour II
maybe a Madam Tussaud's Experience where you get to see your favorite Disney characters in person in standing wax figures
take out American Idol and replace it with a WIPEOUT obstacle course interactive experience
make Fantasmic better, modernize it. add more contemporary movies to the Dancing bubble scene, change the Pocahontas scene to Pirates of the Caribbean AWE or something, idk just update Fantasmic
change the Great Movie Ride to, instead of going through MGM movies, go through a history of breakthroughs in film.