And it's a catastrophe for users if third party markets like Steam don't fit seamlessly into the future of Windows.
It's disingenuous for Gabe to talk about how much of a 'Catastrophe' Windows 8 is going to be or how touch screens are "Short-term" but leave out the fact that these fears stem from it's possible impact on Steam's bottom line
Short-term, if they can still get their games through Microsoft's own market, they won't care.
Once they level the playing field (by allowing users to use Stream or the MS App Store without penalty), Microsoft can start to try and draw users away from 3rd party services. However, in the short term, it's hard to imagine them drawing users from steam and forcing those same users to abandon their investment in steam.
It may or may not happen, but I like the idea of having multiple options.