Im not sure what the Pixar issue is. Obviously people all over the world enjoy the Pixar movies and love the characters. For that reason they appear in the Disney Themeparks. Even though I agree that TSPL not the best attraction is in a 'studio's' park and that I would have rather seen Discoveryland in the Jules Verne theme more than current.
I think Disney was a great man who was groundbreaking in it movies, filming technologie, parks, monorails, animatronics, character choices and so much more always looking to developments and the future of his products. If Pixar has been so succesful over the years, and computer animation is the future than why not implement it in the parks? Keeping DLRP the same way it has been, is a horrible idea. WDW's MK was a better park than DLR. And DLRP has some more improvements (attractions, theming etc). Everything evolves over the years and maybe Pixar is the next step (seen its success, I think a very good choice). So my idea is to stop seeing it as a negative point and that the question should be how to use the Pixar treasure to create new, original experiences for all ages... like they did with Toy Story Midway Mania.