I seen a doc about this a few years ago, Disney said they had to stop making 2D cartoons because kids were not interested in it anymore and they were not making any money from it because of the 3D cartoons like that from pixar. Thats why you see all the classics made into 3D now, its terrible.
But one of the guys from Disney said it is a shame because 2D cartoons are an artform themselves and cannot give the same effect as 3D ones. I miss 2D cartoons alot, when they didnt have to go over the top with effects and just focused on a good story.
I just ordered Alice in Wonderland a while ago, one of the disney films I never saw properly the whole way through.