I don't wear glasses but that's the primary form factor I can imagine. Already socially and legally acceptable, non-audible communication channel plus low-volume audio, points in a direction that generally matches attention. And pre-AI investment in augmented reality has given it a head start.
Maybe, but plenty of people are prepared to poke their fingers in their eyes every morning in order to avoid wearing glasses, so it can't be all that popular a form factor.
Kind of like torn jeans. Before the mid sixties torn clothing would signify economic disadvantage and you’d avoid it if possible but afterwards it signified rebellion and people wanted to signal rebelliousness with torn jeans or at least signal being part of an in-group however large and diluted it be.