Take for example video games. They distracted many people from movies, but also created a huge new field, hungry for talents. Or another one, quite a few genres calcified into distinctive boring styles over the years (see anything related to manga/anime as an example) simply because those styles require less mechanical work and are cheaper to produce. They could use a deep refresh. This tech will also lead to novel applications, created by those who embraced it and are willing to learn the increasingly complex toolset. That's what been happening the last several decades, which have seen several tech revolutions.
>As long as these networks continue being trained on artists' work
This misses the point. The real power of those things is not in the collection of styles baked into it. It's in the ability to learn new stuff. Finetuning and style transfer is what all the wizards do. Construct your own visual style by hand, make it produce more of that. And that's not just about static 2D images; neither do 2D illustrators represent all artists in the broad sense. Everyone who types "blah blah in the style of Ilya Kuvshinov" or is using img2img or whatever is just missing out, because the same stuff is going to be everywhere real soon.