I saw the title and I almost cried. It's a dream team.
If we're gonna go into the viscerals of motion peripherics, I can almost assure they won't live long past this generation. It's Nintendo's market campaign; they don't intend for the Wii to have be a rebruttal to the other two massive consoles in the market at the moment; Nintendo's console is economic genius.
We would have to first take the economic position of games nowadays. In order to make what one would label as a AAA game, a lot of money must be involved in the project, now more than ever, to meet acceptable standards regarding audio and graphical fidelity; with that in mind, Nintendo did one of the most sneaky and genius moves any system has ever done, the offered a gimick that appeals to massive amounts of people, merely because of the fact that it's something new that no one had ever seen before, besides, it's price makes it efurthermore appealing to people who are buying their first "next-gen" console. The main problem with the Wii is that despite being very easy to market and sell, it doesn't have much long-term appeal. I know my Wii has been gathering dust, completely unused (No, don't even make a joke about it), and although it had the best numbers, only a third of the people who bought it still play it regularly; this obviously disencourages 3rd party development even more than the lack of processing power does.
The PS3 and Xbox's new periphericals are pretty much the same, only that it is most likely that they are relying on this sort of short-term appeal to convince players of buying the add-on. It's not something that they expect people to go crazy over, it'll die after a while, leaving nothing but a reminisce of embarrassing movements and a lot of money for it's developers.
Is it the future of gaming? Absolutely not, but is it a smart business operation? Extremely. Nintendo, being the first ones to do this, are already controlling most of the demographic and therefore will make the most profit, but it certainly won't be a loss for Sony and Microsoft.