Most them have protections in place preventing use of their likeness. Directors and other high level professionals will probably have enough money to sue anything that comes out of Runway. It's the artists, vfx, wardrobe, etc (i.e. low level people) that are going to get fucked. None of the savings will be passed to consumers and we will get derivative or rehashed works as a result. Only hope is that the money propping these AI replacements dries up because the studios can't attract movie goers with the even more unoriginal shit they will try to push.