I'm an animation student myself so I know for sure that the process of actual animation is faster in 3D, as is asset creation once you have a good workflow down. But getting to that point requires a lot more time and monetary investment, and I feel like 2D is a less technically-demanding industry than 3D is. You can be a great 2D artist and animator and not have the foggiest how to do it in 3D cause they might not have the logical thinking or technical skills required to create even a single model. Like I said, anyone can open Paint and draw or edit a sprite, not just anyone can open up Maya and start modelling, rigging, texturing and animating a character. ...Then again I may just be bitter about how crap I was at 3D animation so hey, take it with a pinch of salt if you want!