At this point in a consoles lifespan, exclusives matter a lot less than many here think. Since Kinect has a lot of momentum coming into 2011, I don't see things changing. While most hard core gamers will enjoy great exclusives (for either console) most of them already have purchased a console and really won't need to purchase another.
"If you've got them by the balls their hearts and minds will follow."
Quote by- The Imortal John Wayne, the original BADASS!