You are assuming that's what people want to see. We still have a long way to go before any human can be eliminated from the big screen. Issues with details such as hands and eyes are still way to obvious.
Also, hand and face issues are rapidly improving, I can easily believe models like Sora getting used for replacing extras despite the flaws it still has.
If you want to achieve almost the same for 0.1% of the cost with 1 very talented person and some computing power (or small team of talented writers/artists), it won't take long and Hollywood's business will collapse. You don't need to pay a cent to that old guy in the video.
Current A-listers will slowly fade while milking their residual fame, but more importantly there won't be a next generation in same way it was till now. A major shift indeed, bigger than Hollywood ever saw. If the quality is there it will be unstoppable and unions won't make any difference, next country with more liberal laws can render very same stuff.
As the cost of producing it drops, AI content may come to be seen as worthless background noise to culture and verified human-made media valued.