Commercial games are, for the most part, dead on the Linux desktop. There are some occasional exceptions but for the most part, if you want a big-name game to appear on Linux you're gonna have to go use WINE as native builds probably won't exist. That said, there are still quite a lot of decent older games which have Linux ports and Ryan does continue development on ports for commercial when he can.
I think if you really want to avoid disappointment with regards to Linux gaming and want to continue enjoying gaming on Linux... get used to indy games, and forget the big-budget commercial stuff. Indy developers need all the audience they can get and as the Humble Bundles have shown, Linux users are often the most generous per purchase due to a desperate need for games. :)
Big-name commercial studios like EPIC and iD have abandoned Linux (unlike his previous games John Carmack has expressed a certain doubt about supporting Linux with Rage). It would certainly be NICE if we could get more commercial support, but until that happens, it's less depressing to just aim for indy games.