As of Tonight, 1900 Steam Games For Linux (phoronix.com)
New submitter KGIII writes: "After a recent Steam change, there were more than 1,900 Steam Linux games listed as Valve ended up including yet-to-be-released Linux game ports. That total including unreleased Linux games is now up to 2,009! But in terms of released Linux game titles available for download right now, the 1,900 threshold was crossed tonight to end out February." It's getting there. All of you gamers might just be able to make the choice to move to Linux soon. It looks like there are quite a few more games coming down the pipe. This is a good thing as it gives gamers more options for their operating system. I imagine this bodes well for the SteamOS project and for the dedicated SteamOS devices.
Steam carries a lot of good games for linux now but there are still a number of big franchises that haven't made it across. I don't think they will make the move until they move to their next major engine release.
That said I suspect that game developers are going to be watching microsofts movements with their push for a windows store again and won't want to be stuck in windows if microsoft starts putting in over the top requirements.
I often get snooty comments from work colleagues about how I'm playing Triple A, or Double A (or some such arbitrary designation of gaming quality) late. Then when some AAA game comes out on Linux I get comments along the lines of "well you haven't got (insert arbitrary game) on Linux"
I am happy with my game collection (177 of 210 games in my library play natively on Linux) and with quality ports coming from companies like Feral on an increasingly regular basis and newer engines like Unreal 4 (and I assume Source 2) supporting Linux natively things can only get better.
I have more than enough quality games still to play I'm currently playing XCom2 and when I want to take a break from that I'm part way through Alien Isolation, SpecOps: The Line and Metro Last Light. When I finish them I'll have Saints Row 4, ARK: Survival Evolved and I may replay Bioshock Infinite since I've got a better graphics card for XCom. I'm sure by the time I've worked my way through those there will be more games available.
I don't actually think it's primarily gaming that will switch people to Linux because Windows has that locked down. I think people will only seriously consider switching when Linux becomes more user friendly and superior to Windows for novice users (it's already superior if you understand ssh, bash scripting, systemctl, CLI, etc). Apple were smart enough to know they couldn't compete on gaming so focused on other areas like UI, use ability, security, iTunes and cornered certain professionals one by one (music production, desktop publishing, graphic, video, etc).
Windows looks like it's going down a bad path at the moment and of they continue with their gimmicky OS's and don't return to the solid Windows 7 type system then they'll accelerate the migration. Also improved virtualization may eventually mean you can run Windows games in Linux at pretty much native speeds. And virtualization seems to be the big thing everyone is concerned about at the moment.