Speaking as an old-ish animator...
Animation was simple 30 years ago. It was getting complicated 15 years ago. It's bloody complicated today.
There are so many disciplines, and more are being added all the time as we (and pioneering clever people) discover new things to do and ways to do them. The things that used to be time consuming are made easier for sure, but this is an industry obsessed with doing more for the same price (just like the chip industry), and where you just needed artistry 20+ years ago to be among the best, today you need a degree in mathematics. Well you don't, but it helps a bunch depending on your chosen field.
There will always be work for those who invest themselves, but it won't always pay well. But apparently there won't be enough food to feed the whole world sometime in the future too...that's progress for you.