The idea of having no privacy in public doesn't extend to every cause and creeper creating their own spy system. They are rarely going to focus on useful 'powers that be' issues. They are going to be all about asymmetrical exploitation. If this is let go, anyone with minimal skills and intent will be fully weaponized, some will organize as they do now for lulz or outright malicious activities like doxxing and blackmail, but amplified and "accepted" (without critique, just "cool" innovation for infiltration), and this will be another unrelenting assault on society.

There's no good normal from some people being able to deeply track some other people using all the tools available. It should be strictly forbidden for individuals and corporations to collect and organize this information, and use by government should be strictly limited.

On the other hand, it should be perfectly normal and good for individuals to deeply track companies and governments as bodies. The lack of a society wide focus on this aspect is quite troubling.

Democratize the invasion of privacy!

In all seriousness, your point about Beijing and London makes sense - the horse has bolted on public filming, so every citizen having an always-on camera is probably the best and most likely outcome.