I think each has good points and their own merits. I don't mind either really. I don't like one above the other, though for a movie series and tv series I can see why some would prefer cgi. It can look more realistic, and with some once you have the background done you can reuse it and the characters more easily then drawing from scratch. Though hand drawn may continue to decline, I'm not sure if it'll eventually completely disappear, at least not in the near future.