Question is, if Windows becomes a closed ecosystem or flops altogether, would PC gamers elect to move to Linux? Even if they do, there's going to be a significant loss of numbers along the way, and it's already a smaller market than consoles. I can see a future where most game companies (barring maybe Valve, Blizzard, and a few others) cut their losses and decide to focus solely on consoles and iOS/Android. That would be a sad future indeed.
I'd suggest that the users will move to what ever platform best allows them to play games from their steam libraries. Gabe's end game has to be that the users aren't even aware they've moved to Linux; they just plug in their steambox and play their games.
