Okay, this is a very serious question that's not intended to troll whatsoever, but why is everyone taking Gabe Newell's doomsday predictions about Windows 8 into even the slightest amount of consideration?
Windows 8 did not stop me from installing and running Steam (which I have right now and am currently playing CoH for the first time thanks to the HIB). So it can't be that he thinks Windows 8 won't "allow" Steam.
Is it just his assumption that Microsoft will eventually make the whole operating system locked down? If so, on what basis? It's been several revisions since OS X and iOS began to mold together, and even then OS X still does not bar you from installing apps outside the app store. So why the hell would he have reason to believe the most used operating system on the planet that got where it is by being installable on a wide range of configurations and having the ability to run a wide range of applications will suddenly and abruptly (or even gradually) lock it down to the the point where "outside" software can't be installed?
I have poured over articles about what he thinks and the strongest fear I seem to be able to find is this vague idea that soon Windows will not allow applications outside the Windows store to be installed (which in itself is quite ridiculous). Some sites even speculate that Newell means he thinks Desktop mode might be removed altogether.
He also seems scared that users will be influenced to buy from the Windows Store rather than Steam, to which my response is "What the actual fuck?" Steam users have been proven to be extremely loyal to their platform. They're not going to go "oh look, Windows Store, I should just get games from there". Does he not have even the slightest faith in his own users?
Yes, there's a Windows store. Microsoft wanted to do it at some point, and there was no better time to do so than now. When a company like Valve builds their livlihood inside someone else's kitchen, they really shouldn't be surprised if there's a bit of competition. What Valve needs to do is trust that its users (who obtained Steam by downloading it manually and installing it just as they always have been) to stick with them.
The amount of monumentally colossal backlash that would smite down upon Microsoft if they locked out external applications is far too big of a risk and Microsoft is not stupid; they are very aware of this. Until I see hard facts about how on a technical level Windows is literally preventing the installation and usage of external apps, I hate to say this, but Newell is out of his mind, and for some reason, people seem to be licking up his words as though they're the truth sent straight from god.
It seems to me that internet users tend to get so riled up by "potential outcomes" that they begin to take predictions to be reality, and that quite frankly is terrifying.