In summary : Not cool enough for non geeks and not good enough for geeks.
While I concur with that assessment, I still see huge potential. Like the Apple "Newton", the Google Glass is probably ahead of the curve, both the technological and social
The more I think of it, the more I see it integrated with the car controls. With product location and pricing at stores. meta content on movies and TV programs.
I don't know how long it will take to be a reality but as I pointed out on my original post, 20 years does not seem to be that far these days.