For me, its not that Pixar is going into the parks; that I can accept. What I have a problem with is Pixar attractions going into areas where they should not be, or into attractions that don't fit the theme or the land/park.
For example, I'm all for Monsters Inc Laugh Floor, but it doesn't fit into the theme of Tomorrowland, no matter how hard Disney tries to make it fit. Yes, the idea of the Expo Center is helpful, but still, there is nothing futuristic about Monsters Inc, so why is it in Tomorrowand?
Another area would be Nemo going into the former Living Seas pavilion. Now, I've said before that this had the makings of a great pavilion, but WDI fell short with the storyline. The ride itself is just a remash of the movie. I feel the attractions at Epcot should be a) educational, b)inspiring, and/or c) an experience you could never have anywhere else. The Seas isn't any of these things right now, and it could very easily be all of those things. In its current state, its a glorified Fantasyland attraction with no educational or inspirational aspect to it, and does not fit into the ideas of Epcot.
Of course Pixar should be in Disney parks, but they have to fit into the theme of the park or land they are placed in. For me, it just seems that Disney is so intent on getting all things Pixar into the parks that they are forgetting the basic theming/purpose that made the parks so great in the first place. :shrug: