Bold of you to assume those of us in our 30s now will make it beyond our 50s. /s
Jokes aside, I think there's 2 kinds of people who relate to these memes: those who spent their 20s hunched over a keyboard and got no exercise after work, and those who worked manual labor for a company that worked them to the point of permanent injury.
But they will stop hiring artists, and that's more to the point of what they were saying. We're already seeing some jobs being replaced with algorithms (mostly stuff like shitty click bait journalism, but still), and art has long been considered a skill not worth paying for. In centuries past, art used to be something only the rich could afford. Now, people get upset if artists charge $60 for a commission.
The algorithms won't need to produce work better than we can, or even equal. It just needs to make stuff that seems value appropriate. People have already made algorithms to imitate certain popular artists' styles, and they've seen a hit to their income as a result. Why get a commission done from one of them when you can go online and get 50 for free that are kinda close, and then just pick the one you like.