A toddler's crayon art doesn't end up in the Louvre, nor does AI slop. Most art is bad art and it's been this way since the dawn of humanity. For as long as we can distinguish good art from bad art we can curate and there is nothing to worry about.
Not because you can't distinguish between _one_ bad piece and _one_ good piece, but because there is so much production capacity that no human will ever be able to look at most of it.
And it's not just the AI stuff that will suffer here, all of it goes into the same pool, and humans sample from that pool (using various methodologies). At some point the pool becomes mostly urine.
If nothing else, it’s now much more feasible for them to be successful by sheer force of drowning out any “worthwhile” material.
Why does any human have to look at any art in your problem statement?