"I'm not sure I'd argue Motion+ succeeded as a peripheral and I certainly wouldn't argue the Balance Board did (yes, it sold a lot, but entirely because of Wii Fit; it got barely any support outside of that, and wasn't even available separately)."
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[/size]Motion + succeeded because Wii Sports Resort sold gangbusters. It's still in Top 20 in Japan. The Balance Board was even more of a success -- how is this even a question? Since it wasn't available separately from Wii Fit, there's no point in even discussing them separately. From Nintendo's perspective, Balance Board = Wii Fit. One was made to make the other possible. They don't care if Rock 'n Roll Climber uses it or not. They made a product and they sold millions. Same thing with Motion +. It gave them the ability to do Resort. Did it bring with it a wave of awesome new M+ games? No. But Resort sold millions. Bam, success. Not to mention their premier franchise depends of M+, and will, it seems, moving on in the future. I predict once Motion + is standard remote from the beginning of a generation with Wii U, you'll see some amazing uses of it that wouldn't materialize with the split user base of the Wii.
[/size]Anyway. My nephew has a uDraw tablet. Then again, my nephew's parents bought a Tatsunoko vs. Capcom joystick to play Pac-Man on VC. So.....