If all the games currently on Steam were to be made to run native in Linux, and it became a prime target on equal standing with Windows, yes, I would.
Until then, though, the sheer inconvenience of having to sacrifice access to past and future games for the sake of an OS will keep me with Windows 7.
Note, Windows 7. I'm getting a new laptop this fall, just before Windows 8 hits the market, and I intend to stick to Windows 7 for as long as I can. Hopefully by the time I need another upgrade, Windows 8's flaws will be well documented and fixed - or a new version of Windows will come along to replace it.