I hope that the folks at the forefront of trying to unionize the game industry are talking to existing entertainment unions. I suspect there's a lot of similarities, especially when you get into absurdly huge projects like a sprawling open-world game or an animated feature.

(And by 'animated' I include pretty much every effects-laden action film. IIRC there is not currently an effects worker union in Hollywood, while there is an animators union - guess which craft sucks less to be in?)