No one thought motion interactions was going to work and most wrote the Wii off as little more than a short-term fad. Now both of its competitors have copied the concept. Nintendo will know if the overly expensive screen controller is going to work well before the Wii U is released, all they have to do is see how well it works out for Sony.
Dumb move on Sony’s part. Copying a concept is generally acceptable but copying and then rushing to beat the originator of the concept to the market is just dumb. Nintendo will now have over six months to study any failures on Sony’s part and learn from their mistakes. They should have waited and learned from Nintendo’s mistakes, that’s why the Move is so much better than the Wiimote.