Mobile is still new. Tablet is VERY new. Motion/kinect is basically nonexistant. So, understanding where the market is should change the way you target it.
Launching an app on the app store is probably akin to launching a blog in 2002-2005. There was competition, but it was still relatively little compared to now, but there was still enough competition that you had to hustle to get noticed. Launch a blog now and nobody cares. You have to make them care.
If you think pushing an app is hard now, wait 5 years.