The game industry will do just fine with a union presence. It won't die.
Solo game developers will feel no union pressure, nor will small teams.
If there are triple-A studios that are so fragile that they'll go under with their employees getting better working conditions, I will shed no tear for those. I will shed no tear for any employer whose continued business success depends on working staff 80, 120 hours a week, in the game industry or any other.
Indie films still get made, big actors work at scale, or certain content shifts to new platforms (e.g. streaming). The decline of independence in Hollywood has little to do with unions and more to do with unregulated, entertainment industry monopolies.
Who do you think enforces those monopolies? Working outside SAG can have deleterious effects on your access to future roles. Disobeying Disney as a movie theater can sink your access to their future releases. Both the institution and the union work together to make the monopoly. They are two sides of the same coin.
Psy, gangnam style becoming a billion-view hit doesn't happen in a heavily controlled music industry. YouTube made that happen. Unions are bad news and they are meant to be. The decade of good is over.
Again, this is a failure of imagination, believing that unions are inevitably shaped like the unions of the past. As tech is founded on disruption and innovation, it is defeatism to assume that worker relationships have to be a certain way- especially when there are models of unions and management having a less antagonistic relationship, as in Germany.
Solo game developers will feel no union pressure, nor will small teams.
If there are triple-A studios that are so fragile that they'll go under with their employees getting better working conditions, I will shed no tear for those. I will shed no tear for any employer whose continued business success depends on working staff 80, 120 hours a week, in the game industry or any other.