I don't have one and don't want one, but I could see head-tracking, voice commands for adjusting driver assists, driver face recognition for endurance driver swaps, wheel/pedal control simulation (Burnout, a faster and twitchier game, has already done it successfully), and probably menu navigation. There's no technical reason you couldn't play the entire game with Kinect if that was your preference.
And you don't need to use a pretend steering wheel, you could use anything round and it would work fine, even if it was attached to something in front of you. I don't care for Kinect or motion gaming either but some of you sound like fanboys talking about the things it "can't do" or how stupid it would be to play with it. Millions bought Mario Kart and the Wii Wheel, so I guess not everyone is a pretentious simulation nerd.
And "making the game worse?" If they sell more copies of the game, or more copies of Kinect, then the studio gets more money and that means more development time, additional staff, and more licensing. I take it you guys aren't business people? How do you think the game will get better in time if the studio is constantly narrowing their market to simulation racers and losing customers?