I mean come on, it has got to be a business decision. If Gamers were there, they would have made it. How much investment do you expect them to make when only 1% of the world wide Desktop uses linux and possibly less than 10% of that 1% are gamers?
I mean Mac Gamers don't complain as much when they have higher market shares.
If he is so threatened, his business decision should be to do something about it. Valve did, and push Linux gaming quit a lot. Epic do it very lazily. Good thing their Unreal engine works on Linux, but they didn't put a lot of effort in it. Lot's was done by third party and community developers to make it work.
I mean Mac Gamers don't complain as much when they have higher market shares.