I can imagine companies like Disney going for this, as they insist on having cast members that have the purest of pasts and will not cause controversy with parents who are entrusting Disney with their children's time. It's like a vice clause for VCs' LPs. What better way to avoid controversy than to hire an actor who cannot cause controversy, by not actually existing.
Not sure if that's actually ever been an issue for a company like Disney, and I'm sure that the supply of actors they have access to is broad enough that it's impossible for them to find someone who will comply with their requirements. But who knows, maybe they'll go for AI talent too.
Ultimately my hunch is that AI actors will be used to save on cost, not to reduce controversy.