Unions on the game industry would never work, reason why game industry is so abusive is two fold:
1. A lot of young people believe working with games is only fun, providing endless bodies to be hired and replace the previous young that realized how much it suck that they quit.
2. Games market follow a very strong winner takes all model, a few games have all profits, literally thousands games are released yearly that nobody ever heard of or bought.
As such here is the situation:
1. Very few companies (because of previous point 2) can afford to pay good wages and benefits.
2. The few companies that actually are wealthy, get so much applicants that every year starry eyed talented newbies will join for shit pay. Hell, when I had my own company people wanted to work for free even!
3. If a union starts to form, the company will just get rid of it somehow, even if is extremely bad PR, because people will still willingly throw themselves at such jobs thinking "EA Spouse" description of crunch time is a dream, not a nightmare.
Note: currently unemployed again. I am in love enough with games to want to brave all its shittyness, but I don't have my hopes up that I will get a game job, because my wife is pregnant and I need wages that allow me to take care of 3 people now, and I know in the game industry this is very unlikely. When I first finished university nongames companies offered me usually at least 3x what game industry did for same positions. My first job ended with me getting 5x the highest offer I got from game industry. I accepted it because the game industry offer was lower than my student debt repayments for my Game Design and Production degree...