PC sales were in a decline before Windows 8 even released. Everyone and their brother knew how Windows 8 was gonna be and yet there was no up-surge of PC sales before hand, so people could get Windows 7 before it was to late. While Windows 8 may play a part in it, it is a very small part. The decline in PC sales are mostly the 2 factors I mentioned before. Hell even Apple has seen a decline in the last year or two.Mobile is definitely one large factor, however W8 sucking is still another. It's not just me -- a friend at work's laptop died and she was being told by many friends and even sales people to hold off due to W8 and the Metro / lack of start menu. Additional supporting evidence -- just in the past few months the head of Windows is gone at MS (Sinofsky) and then Ballmer's retirement is PUSHED. Ballmer was pushed out by Bill Gates for running his company like shit and W8 was the final straw (this is truth not crazy ass rumor). We also have MS quickly announcing a W8.1 with a lite start menu. There are often multiple things happening at the same time, and the combo of people with fast enuff computers, more mobile platforms, and W8 sucking has led to the large PC decline.
As for people at MS losing their jobs, well if they had done more with Windows Rt then maybe they wouldn't have had to worry about it. How many MILLIONS where lost to RT? Someone head has got to roll for that big of a hit.