The article says $100. That's a big difference.

Of course, it will have to come down farther if video game manufacturers are going to consider spending $ developing features for people using these. Right now, spending time designing a game for this kind of interaction means you'll be able to sell it on the Wii.

When the PC, PS3, and XBox start having these kinds of input devices, game (and software) manufacturers will take much more notice.