I saw this article but I don't think it has anything to do with Windows 8. There is just little reason to upgrade one's pc anymore. I evaluated my current setup at home where I do extensive video editing and encoding, so I need all the cpu power I can get. Yet my office pc is still a 3 year old sandy bridge cpu. Because while Intel keeps making me want to buy a new motherboard, cpu and reinstall everything to get 10% speed increase here and 10% speed increase there, meanwhile I slapped in an ancient NVidia 560ti and got a 400% increase in video encoding speed, and can view video in realtime on the editing timeline even with lots of effects piled on, something still not possible with Intel's latest and fastest cpu's.
So I had to wonder, if I don't need to upgrade even though what I do for my business is very cpu intensive, they why in heck would the average person need to even bother when they just need it for typical daily tasks. Same with my gaming pc, it's also a 3 year old sandy bridge machine. I changed the video card once and will probably change it once again once the new consoles come out, and that's it. It will probably last for years as it is.
There just isn't a whole lot of need to upgrade a pc anymore.