Using the likeness in perpetuity is insane.

I think this could be fair for background actors _if_ it was scoped to a single project.

Come in, get scanned, maybe do some mannerism mocap and then get the negotiated day rate. The rate for a single day should be higher than it is currently, but still less than the studio currently pays for multiple days of background work.

This would be closer to a win-win: the background actor gets paid more money for fewer hours of work, and the studio spends less money overall on background actors.