I mean, to me, this is amazingly obviously the goal.
Games run better ~5% fps better now on Linux (when using a distro configured for gaming) than they do on Windows.
As you say, last technical obstacle is kernel AC rootkits.
Solve that, anyone still gaming on Windows is a MSFT fanboy, afraid of change, whatever.
But they have very little actual solid reason to remain on Windows.
Start getting people outta Windows for home PCs, it becomes basically just a shitty corpo OS.
Rather, not OS... but ecosystem.