That’s true, and there are people who go see movies specifically because of whom appears in them. But I’d hesitate to call that the majority, especially in gaming. The set of people that play games and the set of people who follow the industry are certainly overlapping, but are far from identical.
Sad to say, but the union probably won’t get many meaningful concessions from this one. The technologies to fully generate model movement (motion capture) and emotive voice (voice acting) are already reasonably mature and constantly improving.
The artists will (rightfully) get strong control over their own likenesses, but if they think they’re going to stop mass adoption of AI in video games they’re dreaming.