That's not how the Hollywood talent unions work...
They don't control access; any production can hire any actor they want. The unions just negotiate a minimum wage for actors working on productions at major studios.
Your suggestion is horrific: you're suggesting that indie films should be allowed to profit off of someone's image without paying for them.
I don't read it that way at all. You would no more be able to steal someone's image and pretend it was them than you could use a famous bands music in your soundtrack without paying for it.
As I see it, a budding filmmaker could use two or three actors to fill 20 different roles in a film without needing expensive prop and makeup artists to place them in detailed fantasy/sci-fi scenes.
They don't control access; any production can hire any actor they want. The unions just negotiate a minimum wage for actors working on productions at major studios.
Your suggestion is horrific: you're suggesting that indie films should be allowed to profit off of someone's image without paying for them.