It will be interesting to see what this does to the state of GL support, Wayland, scheduler, etc. Steam telemetry will give Valve a lot of data about how different hardware/software/driver configurations are working but on Linux they'll be able to actually push patches to distros if need be. I would love to see Valve profile Source on Linux and start shaving sources of latency and jitter, it could eventually be better than Windows for competitive gaming.