Apparently 2D animation is more expensive and time consuming than 3D which is why a lot of "cartoons" are becoming 3D or live action shows. The spin offs we are getting from these films are basically all of these live action shows that are cheaper to make. I know very little of the process but I do see 2D and 3D people work and the process for making 3D come to life is definitely quicker so time if probably a factor too.