And AI generated art will replace a lot of 'decorative art', perhaps not art that hangs in galleries and provokes thought but that people buy because it looks nice on their wall, or as a screen saver, or t-shirt. If that means that there's less demand for humans producing this kind of artwork - there will be less people making it and fewer good training images.
In "high art" there's always been artists like Jeff Koons or Damien Hirst who direct other artists and technicians in the production of their artwork, or even apprentices painting large parts of a master renaissance painters work. With AI generated Art I can't help seeing a future where the brand becomes more important than the art - images created from the description/thoughts of Lady Gaga/Kanye West