I personally like 2-D much better than the CGI films. I liked the Pixar movies from Toy Story-the Incredibles. But Cars, Ratatouille, and WALLE were stupid and forgettable films in my opinion. And Valiant, Chicken Little, and Cars were nowhere near as good as the 2-D films. The reason the traditional animation films were classics were because they spent a lot of time on them.
By the way, I havent heard anywher about the Princess and the Frog being the last animated movie. Actually, I heard if it does well they will start making more traditonal animated films. This looks like it will be a good movie. I think it would be better than Disney's recent 2-D films(Atlantis , Treasure Planet, Brother Bear, Home on the Range, etc.)