Hmm... There are 6 attractions themed around Pixar in Walt Disney World.
MK - Monsters Inc. Laugh Floor, Buzz Lightyear's Space Ranger Spin.
Epcot - The Seas with Nemo & Friends, Turtle Talk with Crush.
MGM - Toy Story Mania.
DAK - Finding Nemo: The Musical.
There's been other attractions (not including rethemes) since 1998 when Buzz Lightyear's Space Ranger Spin opened.
MK - Philharmagic, Many Adventures of Winnie the Pooh, Stitch's Great Escape, Magic Carpets of Aladdin.
Epcot - Test Track, Mission: Space, Soarin.
MGM - Journey to Narnia, American Idol: the Experience, High School Music show, Rock n' Roller Coaster, Sounds Dangerous, Lights Motors Action.
AK - Practically everything, seeing as it opened on April 22nd 1998.
So Pixar isn't really taking over at Walt Disney World. DCA on the other hand...