I honestly would not want to see Disney remake classic films in CG. As an animation fan, it would be a similar slap in the face to colorizing Citizen Kane, except it would be way more expensive, and the implications would be even more upsetting. I don't want to see Disney sell out and cheapen their classics by replacing them in the public eye with tarted up CG remakes just because CG is more bankable at the moment. They are two distinct mediums, and I think that all of Disney's 2D classics look fine the way they are. Many animation fans prefer the look of 2D animation, and since 2D is not as popular these days, remaking old films in CG would be the final, ultimate insult against the 2D medium.
I also love that tangled pic. I loved the movie and I honestly wouldn't change a thing about it, and it was especially nice seeing it in 3D. However, I don't think it would have struggled quite as hard to demonstrate its identity to the public if it had been a 2D film. It had to compete with all the other CG films this year, and unfortunately the trailers made a lot of people compare it to Shrek. I think what the film needed more than anything else was better marketing, but in general I'd prefer that 2D remain the norm for the films in the Disney canon. Either that, or Pixar should start making some 2D films!