The wiis motion controls are killing the console, it has isolated many gamers through it's inaccurate and unresponsive approach. But the market they are aiming for enjoys it, so it's a double-edged sword, it makes money for the mainstream, but with those who want an actual gaming experience tend to steer away from the gimicks.
I think the other consoles shouldn't worry about motion sensitivity until nintendo has it down pat (unless nintendo keeps patenting things at the rate they are, their might not be any room for the rest of the industry to grow, without infinging some copyright.
But as Chicago Ted said, it is the literal next step in gaming, the industry giants just need to get it right, once they have it fine tuned and expertly designed, I think that this premise could be the very thing that SAVES gaming and brings in a much wider audience... speaking of which anyone ever see a non-gamer attempt to hold a 360 controller, especially if they have never encountered one previously, to put it short it is rather hillarious.