How would the mainstream view it?
How would software support improve?
How would gaming look like?
Which country will become the first Linux majority? India? Seychelles?
How many local governments would start adopting it?
What year do you think it will happen in?
Actually I think games would just include Linux Kernel modules for Anti-Cheat (which would be terrible as the Kernel has no consistent internal api). Or whole kernels that run in a hypervisor.
Never underestimate greed.