Not so long ago this was also the thought about mobile phones, now everyone is walking around with them so they can film/pic anyone all the time while 'faking' to be doing something else. If there is any convenience for people to be had, they will go for it. I think the convenience part over phones is just not there (yet). The experience is just not yet anything worthwhile / good / smooth so it's just lame, cringy and clunky, outside of filming. Maybe someone will make something that works, maybe it will be something completely different.

But if it gets a smartphone moment, no-one will talk about the privacy and the cameras anymore and that's why they keep trying.