According to the Steam statistics, Linux is still part of the one percent of gamers on that platform. However, the other statistics show that the average Linux gamer has a quad-core Intel pushing 3.7 GHz with 12 gigs of memory and sporting a GeForce 1060 running Ubuntu 16.04 LTS with 18.04 LTS not far behind.
That is quite impressive for an open source operating system. While people say that Linux is only good for old computers, the stats tell a different story. Also Canonical has publish some of their information that they have gathered during the release of Ubuntu 18.04 LTS, and it is painting a similar picture with average resolutions of 1080. This shows that the average Linux users are upgrading their computer and could be Linux gamers.
I feel that as more Linux users try out gaming on their computers that there could be more growth in the Linux gaming industry. I know that it is a pleasure playing games in Linux verses Windows. The main reason is the smoothness of the game with reaction to my keyboard and mouse. I currently on have Ubuntu 18.04 LTS installed on all my computers and do not see a reason to change.