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Kevin Tofel at Gigaom is right on the money writing No IDC, wearables won’t limit tablet sales growth. As he says, the research firm named wearable computers as one of the brakes on tablet sales growth. Tofel’s objection is innovative wearable devices like smart watches need to do more than offer tablet functionality with a tiny screen.

That’s part of it. Another argument is that while tablets can meet people’s computing needs for most of the time, tiny devices won’t. At least not for a long, long time.

On the other hand, if wearable sales take off, they may divert customers’ money away from other devices.