This kind of logic really makes no sense to me.
No matter how old the OS is, if it's capable of playing a game then, it'll still be capable of playing that same game in the future. On the other hand, as long as Linux remains as niche as it is, a large portion of future games will continue to not work on Linux. Basically, you have a choice between an OS that's no longer being updated that can play old games, or a system that can play a very limited selection of games.
What you just said is completely wrong. I used to play world of warcraft on Windows 98 and now it is completely not possible to do so. Why you would lie and spread misinformation is beyond me.