Comfort and looks: In recent years I have seen lots of people move from glasses to contacts or even to laser surgery. And smart glasses will necessarily be even heavier.
Battery life: The announcement says 4 hours. That puts it at "gaming laptop" levels of inconvenience. It will have to be at least day long to be that ubiquitous and improvements of that scale will take many years.
Usability: touch gestures on the frame or a smartphone app make this very non-effortless. The "think or blink in a certain way" is definitely not there yet and I doubt it will be in the next 20 years. Also, that UX would be the innovation, not the glasses it is affixed to.
Banal reason: Look at VR, 3D, google glass,... . Much hype and then nothing. Why should this be any different?
Battery life: The announcement says 4 hours. That puts it at "gaming laptop" levels of inconvenience. It will have to be at least day long to be that ubiquitous and improvements of that scale will take many years.
Usability: touch gestures on the frame or a smartphone app make this very non-effortless. The "think or blink in a certain way" is definitely not there yet and I doubt it will be in the next 20 years. Also, that UX would be the innovation, not the glasses it is affixed to.
Banal reason: Look at VR, 3D, google glass,... . Much hype and then nothing. Why should this be any different?