That's the neat thing about workers' rights. Workers have more interest in making good products than investors, especially in artistic fields. Investors will gladly sabotage a product's quality for the sake of personal gain and move on to the next company with goodwill to exploit, but for workers a job well done is inherently rewarding.

Unionization directly leads to better games with more artistic merit.

Eh. One good game or a sustainable industry?

The big studios are lost anyway, the best they can do now is be a starting place for worker reforms

Better compensation and working conditions typical result in improved productivity and higher quality goods.