All these things could have been said for Android when iOS and Blackberry's OS were kings. The nature of gaming is changing. Listen to Gabe talk about player generated content being the way of the future. Core gamers are a niche bunch, and will spend thousands of dollars for custom hardware. Why would they settle for locked down, legacy software like Windows, when Linux can be made to work just as well if not better,…
Do you have any evidence to support this claim? I've seen plenty of indie games targeting GNU/Linux, but no evidence of large amounts of players so far (the fact that there are GNU/Linux games does not mean that more than few people are playing them). From my personal experience (couple of demos of unfinished projects and loads of time wasted lurking into indie forums like TIG and /r/gamedev) the Windows is still pretty much the standard target platform.