[shirro]

And mostly useless. Most active people would prefer walking or cycling to maintain their fitness. Most inactive people don't have the coordination and would rather sit down on a mobility scooter. It was a cool idea with a limited market.

Glass will succeed if people find it useful enough and the dorkiness will become cool. It is really an extension of the smartphone user interface and smartphones are undeniably useful. People currently wear glasses and those ridiculous bluetooth earpieces so it isn't a big stretch.