I am not surprised Google Glass was a product way ahead if it's time. It can still be useful in closed environment like a factory floor. To be really successful in the consumer market it needed an AI capable of identifying every object it sees which we haven't reached yet. I am personally of the opinion that augmented reality is the future of computers rather than virtual reality. People keep pointing towards privacy as the reason it was not successful which is I feel is wrong. They don't have the tech yet of making it truly useful in the consumer market.