To answer your question: yes 20 years ago we thought we would carry computers in our pockets one day. By we I mean members of our species were knowledgeable on the practicality, viability, and intrinsic profoundness of this idea.I don't think it's going to happen tomorrow, but I don't think it's beyond the realm of possibility. 20 years ago, would we have thought a billion humans would carry $1000 computers in their pocket to make phone calls and share instant pictures of their tiramisu with friends?
People already wear sunglasses. A lot of people wear prescription glasses. We're used to that as an accessory. Is it such a stretch that people would want to stop carrying a glass slab in their pocket and choose to integrate that functionality and an improved display into their eyewear?
Just because Google Glass tanked, doesn't necessarily mean the concept is busted-- it might mean we haven't found the right hardware/use case combination. A variety of styles for something you put on your face is probably part of the winning strategy, for example...
AR glasses on the other hand, no. Of course it can and will happen, but it won’t be used by a statistically significant portion of the population, and therefore it is not something that changes human existence, like the smartphone.
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I believe you and others fail to think about the fact that we humans detest wearing corrective lenses. From a sociological standpoint alone, only sunglasses are truly universally accepted, and this is because they are used by all humans for short periods of time, and not by a small portion of humans for long periods.If we get to the point that AR features could be integrated into normal looking eyewear then I suspect someone will create an item people will buy. Never say never.