I suppose the usual legal argument of no expectation of privacy in a public space applies. However the less formal court of public opinion, social pressure, bu

I suppose the usual legal argument of no expectation of privacy in a public space applies. However the less formal court of public opinion, social pressure, business policies etc will hopefully make these socially unacceptable in enough places as to not be worth it. Certainly I expect I'd ask anyone to take such devices off if they enter my home or engage with me. I encountered Google glass once in public and moved from where I was sitting, my dirty look to the wearer as I did so hopefully making them think twice before brandishing a camera in a stranger's direction.