Well, I am not going to be leaving pc gaming for a few years yet, but I think the next round of consoles will see the end of pc gaming for me.
I bought Bad Company 2 on PC on release, and while it looked great and I did enjoy it to a degree, it felt like something was missing. Bought it on PS3 over the weekend to compare the two, and sure, it doesn't look as good, but hell, I had so much FUN with it.
I think with my job being sat behind a monitor using keyboard and mouse all day, I have come to hate touching mose and keyboard when I am home. Sure, I might still be sitting in front of a screen, but I just find it easier to relax and get into a game with a controller.
And when you get into the game and stop thinking about the difference in how the game looks, the lower res, etc, becomes a non-issue.