Ok, get a good lawyer and write that into any future contracts.
Obviously this will only work for household name actors, but for everyone else it really doesn’t matter. We can already generate faces that are unique [1]. All that remains is deep fake tech getting good enough to take an image like this and apply it to a 1-3 minute scene in a film.
Think of any scene that has many people in it - a bar, a classroom, etc. The audience’s attention is is usually only focused on the main characters, but you still need a lot of other people in the scene to make it feel authentic.
This tech will replace those people.