I've seen this sentiment a bunch of times, but I don't agree. Most people practice skills and make art in order to demonstrate their value to society. Art (and media) doesn't exist in a vacuum, it surely exists for societal reasons.
A person may want to make a game or a comic, but the reason they want to make those things, instead of just consuming existing media, is also to demonstrate their value to society. But they won't have any value either when everyone else can easily make games and comics.
I'm saying AI does not allow anyone to easily make games and comics, at least not for a some while. Currently AI allows you to easily make still pictures, maybe a written chapter of a story. It does not yet compete with artists who do larger pieces of work like a book. And I'm not sure AI ever(?) will make "complete" works because it doesn't have full human background required to have "something to say". It only "mimics" in a manner that many artists focused on technical ability find threatening. So yeah some "artists" will be out of work because of AI, but it will not be a big loss for the community if they are merely replaced.
The surface area of "art with message or meaning" within "all art AI can randomly generate" is so vanishingly small that it doesn't matter. Humans will be in control of the message, and thus in control of art for the foreseeable future.
When the AI finally is smart enough to have something to say, it will be an AGI and humanity will quickly be enslaved to it. No point thinking that far.
I'm sure there are people who don't have ambition to ever show others the skills they've been building, even in indirect ways, but I doubt it's common... What do you think the motivation is?
But most visual art is not just single pictures in a vacuum. Say you want to make a game with 2d still-art, or say a comic. You will need dozens or hundreds of images and they will have to be tied together by a common design — characters and style that look similar in the different images, and most of all you have to have a story to back it up. This is not something AIs can do well, not for a long while, but a human artist now may do significantly better than before with help of "dumb AI", such as the featured Krita plugin.
Finally, most artists don't think like you. It's not "pointless" to do something that can be technically repeated by other humans or AI. You do art because you want to express yourself.