Metro09: 'Single player' has been dying for quite a while now.
I just don't think that is true. I can't really refute your point since you don't explain why you think it is dying...
...but I think a more accurate expression might be that while single player gaming development has leveled out, multi-player gaming has seen tremendous growth.
I have no problem with multi-player only games because I love multi-player gaming. Team Fortress being my prime example.
On the other hand, it is disheartening when a title pops up that offers both single and multi-player functionality, only to find the single-player side to be absurdly short, or used as little more than a primer for multi. I haven't played it yet, but maybe Black Ops is the example I should use... at least from the comments I've read.
Conversely, take Red Dead Redemption which has a nice multi-player function (something GTA never took seriously) but is obviously weighted toward a solid single-player experience with a lot of content to explore.
Weirdly, I don't play multi-player anything on the Xbox. That device is 100% single player in my house. Xbox live is geared toward building circles of friends with your friends that you already know. I'm 44... my friends who do game are more old school and more likely to game on the PC.
Plus, I have found (or at least, it SEEMS to me) that the PC community skews older, which means more mature. I don't run into the 12 year old twats spamming " U R fag" over and over. I tend to be able to find people who are more like me (younger, mostly, but far more civil).