3D animation is cool and is definitely a change that was going to happen, however I do prefer the 2D animation. I feel the 2D animation had more passion and vigor, whereas the 3D animation has nothing to it.
Of course, I do believe Pixar have done wonderfully with 3D animation, but they are known for 3D. Disney started out 2D, and I guess it's kind of hard to accept change. Although, Disney hasn't had the best movies of late, so even a new 2D animation might be crap.