Well-sourced piece by Nick Bilton for the NYT, on why Glass was such a failure:
At the time, unknown to anyone outside X, an impassioned split was forming between X engineers about the most basic functions of Google Glass. One faction argued that it should be worn all day, like a “fashionable device,” while others thought it should be worn only for specific utilitarian functions. Still, nearly everyone at X was in agreement that the current prototype was just that: a prototype, with major kinks to be worked out.
There was one notable dissenter. Mr. Brin knew Google Glass wasn’t a finished product and that it needed work, but he wanted that to take place in public, not in a top-secret lab. Mr. Brin argued that X should release Glass to consumers and use their feedback to iterate and improve the design.
I saw someone last year wearing Glass, at Costco of all places. I remember her telling somebody how much she loved Glass, and how wearable computing was the future.