Given the recent fiasco of Sony, lack of hardware updates for PS3 / X360 in the near future, the fact that you can get better hardware for similar prices (and play with more eye candy on the PC), you have the choice of the controller, or the kb+mouse, with Steam and it's low, low prices, the fact that you can do other things on your PC as well, possibly at the same time, there's no reason why the PC should not be on the rise now and console market share declining...
The only problem is the huge diversity and lack of big players marketing PC as the ultimate gaming accessory, If HP/Dell got their heads around, they have enough selling power to market the idea, and maybe even promote some baseline performance standards (like high performance, medium, low/mobile) as opposed to 20+ SKU that each generation of GPUs have...