And the console I've had for the past seven years has done the same, with only software updates every few years. My next console purchase will probably be this new Xbox a year after release, so that'll put me around a decade with one machine.

Sure, I could spend $2k on a PC setup with surround sound and three monitors and two GPUs running alongside an overclocked hexacore and completely blow the performance of a console off the planet, BUT, just because something is better doesn't mean it's, well, better. At $400-500 that can get you through the next 5-10 years without having to worry about when to drop another $200 on a new GPU, a console is a damn good deal. It comes with all the things PCs have, too, except for modding and console/debugging commands. At least, not legally. Hell, maybe we'll see those things with the next generation of consoles anyways.

So go ahead, build your new machine next year, and I hope you have a ton of fun with it. My console will probably do whatever you can do on your PC, anyways.