Turns out they aren’t that cool. Really the tech’s just not ready yet. Give it another leap or two.
They were killed in part by their recording feature. I will not approach a glasshole, and most certainly will not talk to them until the gadget is safely turned off and removed. It's my choice.
Being a relatively peaceful person, I will not hit a glasshole for him merely existing near me; however plenty of people, especially in drinking establishments, and especially in various states of inebriation, may not feel so constrained.
The gadget may find widespread use in the industry, where it can be operated for a well defined purpose and without a threat to privacy (there is little of that at work, and you don't wear it away from your station.) Businesses will not want to stream anything to Google, and they will not even enable the camera, as there is rarely a need to stream video in real time - except surgeons, for example, who teach others or are monitored by their teachers. A mechanic, for example, could enjoy an easily visible, large drawing of the device in the virtual screen of the GG. Most of the data would be coming into the GG. Even when specifics of the job (assembly of high value, high cost of error items, like space hardware) require recording, one could record on an SD Flash card - there is absolutely no reason to transmit the video over a radio link. Same applies to police officers. If the recordings have limited access, there is not as much threat to privacy as when they are streamed to Google.