Haha, quite probably. Though I would say the Vitality Sensor is not as sure a bet as Wii Fit was, I do think it has a greater potential to be big if only because I would have more confidence in Nintendo making the right software than either of the other two first parties.
A game I'm developing with some friends:
www.xnagg.com/zombieasteroids/publish.htm
It is largely a technical exercise but feedback is appreciated.