*Kids play cops and robbers* That's it! We're going to Ferguson!
Plus it requires us to leave our houses and physically talk to people.
I could see this becoming big for militaries and police, but that's it. They're already talking about making cops wear cameras in Canada. They'd also want it for facial recognition, which means a computer could tell them who is wanted, or if a person has ties that makes them shady.
I think consumer versions won't take off for all the above reasons. Once people realize the other uses for these devices and what that means, I think they'll avoid them (especially since the early adopters probably need to be geeks). Also, there are too many copyright issues out there (i.e. accidentally recording a song in a video you upload, wearing them into movies, watching TV, going into a building that doesn't want you recording, etc.).
Money isn't everything -- but it's a long way ahead of what comes next. -- Sir Edmond Stockdale