And I'm sure a lot of people who thought the iphone and the ipad were incredibly stupid also think glass is incredibly stupid. And of course there are people who thought the iphone and ipad would be massive successes who think the same of glass.
Your ability to predict what amount to fashion trends in the future is not particularly related to your ability to do so in the past.
It is the best predictor, obviously, but I'm saying that doesn't really mean much. Fashion is fickle.
And the thing is, above and beyond that, 10 years from now the tech that's evolved from Glass will look about as much like Glass as the iphone looks like my first touchscreen phone (behold: http://img.engadget.com/common/images/3060000000053553.JPG?0...)
Bingo. The first consumer computer glasses may not be a mass hit. But persistence, innovation, tweaking, and competition will sooner or later hit on a design that sells.
Your ability to predict what amount to fashion trends in the future is not particularly related to your ability to do so in the past.