Good luck to them, but while it's an optional extra for PC and other consoles it will never completely take off as it will need games to support it. Unless there are enough people using it then developers won't include controls for it in their game, it's a classic catch 22. The Wii gets around it because it's the default control system for the console so all games support motion.

And lets not forget the games the peripherals launched with were perfectly suited to its attributes.

@Alby: We know there are various devices with similar functionalities, for example british In2Games have been developing motion controllers for years and they even have had a few controllers in the market.
Basically the tech that makes Wii Remotes motion sensing functionality possible is rather new (accelerometers sensing acceleration in multiple directions) and the pointer functionality is made in completely new fashion.
But, the thing is, that when some another console comes out with motion controller like Wii Remote, it's not going to have a competetive advantage of it, like Wii has. As i said in the OP, it would have been "easy" way to improve and have advantage in the next gen to make a controller function like WM+, but since it's soon out, a controller that works the same way, will be "old" since day one.

^^
I totally agree that Nintendo really launched that tech into mainstream and exploited it like nobody ever before and being first and not standing on its laurels but furtherly developing the idea, it will be difficult to competitors to catch up, my post was just to confirm that unless they blatantly copy Wiimote, competitors should be quite safe on the patents side (and this was confirmed by Nintendo itself).
Ah, just for completeness sake, prior art for 6-D accelerometers+gyroscopes sensing existed for years in some fields of engineering, for example robotics and automation, in robotics it's often used a piezo based force sensing wrist too...
This said, for competitors there's still the big problem of inventing a controller at least as good as the next improved Wiimote, but different

we have to love Nintendo, killing those useless hardcore games and replacing them with friendly games like wii music, ahhh so innovative and you have to love those synthesised instruments, so realistic, feels like I'm play them, also wii play, love the fishing, feels like I'm fishing in real life, the graphics are just so realistic, plus you get a free controller, what a bargain....love the way the futures going, I just hope Nintendo does away with those nasty harder games, geesh who needs them right?

I wholeheartedly agree.

You are correct about not pushing the specs - Nintendo will not push the Specs - MS and Sony made that mistake and have to sell HW at a loss for at least another year. But in 2010 nintendo can do a new console with 2Gb memory and Quad core PowerPC and Blu-ray which trumps the 4 years old PS360 keeps 100 million users on nintendos platforms and still sells at a profit.( i have no doubt they will even do single disk multi-platform transitional game titles to help users migrate more easily.

Way too much faith in BRD.

Like I see it, if 3rd parties go on putting little content on the Wii, there will be zero incentive for Nintendo to move from DVD, as it will be enough. If XB360 can pass this gen with DVD, given the support from 3rd parties that Nintendo has currently, they will stay on DVD.

meh. I wouldn't say its killing it. Nintendo had the rumble out before the others, analog stick out before the others, shoulder buttons, reliable wireless controllers, trigger button, etc. all before the others. Didn't really stop the change in tides did it? Takes more than just a small control change. It takes radical steps, choosing a new path that others are afraid of, and heavy analyzation in areas where competition is blind.

Motion plus should come built-in with 2nd generation wii motes