That's why Hollywood unionized the way it did. A specific studio couldn't unionize because they would just get dissolved and reformed under a new LLC.
No actor or famous game designer is capable of creating a AAA movie/game by themselves. They need a lot of people to work on it.
The only difference is Hollywood the entire pool of workers unionized they have no choice but to hire a union worker.
Game designers/programmers need to follow the same formula. The two industries have exactly the same problem, Hollywood workers have been around long enough to figure out the solution.