Neither does 360 really. Both are doing pretty well.
The one area hurting them (sony.ms) is hardware losses, which probably currently the hardware is profitable, but the "problem" is competition. One will slash prices and force the other to follow.
The xbox will be entering it's sixth year upon Natals release so i disagree on that. With the Blu-Ray factor becoming increasingly significant and the PS3 able to do proper 3D Games/movies plus motion control I'd hazard a guess it's only just starting to build up a head of steam. It's got all the up to date tech to keep it relevent in the next few years. In terms of pricecuts. 2 years ago things such as Blu-Ray were a bit of a meh to most people but now it's becoming a big value added bullet point.