Kenology on 28 November 2009
I don't think there's anything either of them can do to make their motion controls have more of an impact.
That initial impact of see the Wii remote for the first time and playing it was the most impactful moment there was. The novelty has worn off and now motion control will just be seen as another standard way of interacting with games.
We've been playing with motion controls since late 2006 with the Wiimote and, to a lesser extent, the Sixaxis. A new remote from Sony won't do anything the Wiimote hasn't done before with WM+ with some minor improvements and Natal is too much of a question mark to really consider in my opinion.
