So Dance Dance Revolution pads, Guitar Hero guitars, and Singstar mics never sold?

This device does not need to achieve any kind of mass market appeal.  All it has to do is show that all the Wii is is a controller that the other 2 consoles can use as well. 

A lot of genres don't work as well on the Wiimote, so designing a system around it makes no sense.  That's why some of Nintendo's games work better with the gamecube controller.  Not every Wii user wants to buy one of those either.  You can't argue that everyone has a gamecube controller either, because the Wii is obviously more popular than the GC ever was.

If this device doesn't cost too much it could be a lot of fun to play games with it, the Playstation Eye, and/or the Sixaxis as you choose.  If you have the same game types with better graphics, I see nothing wrong with the idea of it.  That said, I don't think the PS3 or 360 need this device. 

Very good point.  A lot of people already have 360s and/or PS3s that are considering getting a Wii.  If similar type games that can involve non-gamers come out with this device, it might save people from having to buy a Wii.  I fit under that category, although I do want to play some former gamecube games with the Wii such as Zelda and Paper Mario.  It will depend on the games.

 Didnt' EA said they want to make games especially for the Wii? No they can (maybe) port it easy on PS3 and X360 with that device.

But yeah it depends what taste of games you like if you like games like Zelda, Mario, Metroid Etc you better buy 
a Wii. 

Obviously it won't see much success without some major support from developers/Sony/Microsoft (which is doubtful right now), but if it does what they say then it could very well be the future. If it proves its worth this could be a standard control method next generation, and whoever holds the patent will be very well off.

Seems to me we were just talking about this exact same concept last week...
http://www.vgchartz.com/forum/thread.php?id=2726&start=0

I don't see it being that much use this generation unless they just bundle it in with a multiplatform game, like someone mentioned, in a Guitar Hero/DDR sort of way. EA wouldn't want to waste the money to port the game over to the systems if the chances of people owning this thing are slim.

Next generation however, I'm sure you'll see something like this included, but there'll certainly be a normal controller too, so that developers can take advantage of having all the types of control.

Yeah, next gen everyone will have laaaaame motion controls. Thats when Nintendo brings out the main event: Virtual Reality Console. And then those lame motion controllers are childs play!

Yep, the big problem is application. Can anyone name any peripheral that has had a major impact on any system's gameplay mid stream -- say, 1 or 2 years into the console's lifespan? I can't. I can name some peripherals that become nice little add ons for afficianados of the few games that used them, such as the Guitar for Guitar Hero or the Camera for EyeToy games, but nothing that actually made it into even 5 percent of the system's games.

Of course, the fact that it's never happened in history doesn't mean it's impossible, it just means it's very unlikely. Let's just repeat this for emphasis: no mid-life peripheral has ever been adopted by more than 10 percent of a console's user base, and no mid-life peripheral has ever been adopted by more than 5 percent of the consoles games (probably much less -- I'm just choosing 5 percent to be safe without doing serious research to find the actual percentages).

This controller will only ever have the appeal of the DDR Pads or Guitar Hero Guitar, these won't become system sellers, they will just be stand alone peripherals.

Unless Sony or Microsoft license this technology it is a loser due to being an accesory .Still ,the tech was announced last year and is kind of cool .

I think this could be very cool, but as an aftermarket add-on it will have a tough time making a go of it. If it is a general-purpose controller with substantial motion elements, like the Wii remote, it might gain some traction as an optional controller in mainstream games. If it's a specialized controller, it will come down to the quality of the games released to work with it -- most of those will likely come from the controller manufacturer, and actually pulling off a Wii Sports-scale phenomenon is a lot harder than coming up with the next Bad Street Brawler.