Will Cortana Drive Kinect Sales?

When/if Cortana lands on the Xbox One, will it drive Xbox owners who bought a Kinect-less console to actually purchase one?

It seems to me that Microsoft is banking on impressive games/apps to drive Kinect sales once this 'cheaper' model is introduced. Essentially, sale 'cheap' models now, make up for it later. The incentive for purchasing a Kinect later would have to be a killer game/feature/app. Maybe Cortanta?