It's hard to know if these efforts are really going to pan out. Valve still hasn't presented a good reason to abandon the Windows platform and the number of people willing to forfeit the console experience in the living room for a Steam Machine is probably quite limited.
I could be wrong but so far their efforts definitely haven't knocked my socks off. The results are quite mediocre (to be generous) compared to what we have today on Windows. And the only support from inside the industry seems to be coming from a few indie devs.
It'd be nice to at least get a small Source 2 demo to show off what Linux can do with modern graphics. Instead we just have these very, very awful ports that seem to confirm a lot of the widespread suspicions about Linux weaknesses.
It seems like when Valve realized that they could make millions by simply culling off a portion of a virtual hat economy, their engineering talent went completely flat. Where the hell are the games? It's hard to get excited about a company that is merely an electronic store.