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In my opinion, the form factor is the key issue.

Ask people if they would wear one? Not just techies, everyday folk out on the street.

Until the form factor is indistinguishable from a pair of sunglasses, this wonderful piece of equipment will remain a niche tool.

And will the average person want wear glasses all the time?

The another point is people might not want to advertise the fact they work for Google in case they are subject to rants from weirdos in bars etc.

This is the one of the main main reasons that British Telecoms' staff where told don't post in the uk.telecom usenet groups.