The concept of privacy in a public place will vanish: if now people in the subway - it's just some people in the subway, in the nearest future, everyone will be able to see your name, place of work, age, orientation and your marital status with the help of augmented reality glasses.
You may ask, "How come, I didn’t leave anything of this on social networks?" Consider such a situation. Suppose a member of a group of enthusiasts from the community "Deanonymizers" automatically reports to an open online database: "I'm in this subway car, see 20 people at this station." Another enthusiast in half an hour reports that the same person, that is you, was seen entering an apartment block, and so on.
Thus, even if your photo cannot be found on the Internet next to your name, Deanonymizers will have the map of your movements and relocations, which sooner or later will acquire more and more details.