I wouldn't mind some Pixar additions (flat rides in the Maliboomer's old spot and helix of Screamin'), but retheming the whole land is ridiculous. California Screamin' wouldn't fit in a Pixar-themed land at all since it has a 48" height requirement and would look intimidating to a lot of Pixar's target demo. Ariel works fine and shouldn't be on the DCA replacement agenda (Hollywoodland and Bug's Land should be the main focus). The current flat rides are well-done and actually fit the 20s/30s vibe of Paradise Pier.
There are so many better ideas for the area IMO (replacing Goofy with a fully-enclosed wild mouse themed to Plane Crazy, a Lonesome Ghosts fun-house-style interactive dark ride, a vaudeville-style show, a Tunnel of Love-style dark ride themed to Disney's romantic scenes, etc.)