I can see using
#SteamPlay for games you already own, but this will bite
#Linux gaming in its ass. Now developers just won't target Linux when the game runs fine in Steam Play. "But buying games w/SP will count as a Linux purchase!" Doesn't negate what I've said, in fact it exacerbates it. "Some games will never be on Linux so this is acceptable." Well, now the chance is less than zero. Console gaming is going to kill itself with streaming and now Linux gaming is dead. Thanks, everyone.