Many Internet technologies like Youtube or soundcloud gave content creators direct access to an audience. If you were funny/creative/talented/attractive/in the right place at the right time/etc you could cut out the middlemen and capitalize on that directly. What is the hidden talent these Spielbergs possess that AI will enable? It's doing the writing, videography, etc. I imagine at most these hidden Spielbergs will be filtering output, like looking at a book of wallpapers and choosing what they like. Maybe some great movies get made, but it will just be the result of selection effects on the sheer number being made.

YouTube is well poised for this.

How will anyone find them, though, if there's so much slop that people stop looking?