Brin's argument is that as the technology to record everything becomes so cheap that the cost is trivial, trying to enforce privacy and anonymity in a sea of cameras is a losing battle. We're better off as a society if we allow the recording and de-anonymization of public spaces, but we should also make this information free to anyone. In return for the loss privacy in public spaces, we should demand that the wealthy and powerful give up some of their privacy as well. Obviously, the wealthy and powerful will fight to keep their privacy, but as recording devices become ubiquitous the landscape favors those pushing to set information free rather than those trying to secure it.
To relate it to the story here, rather than fighting the anonymity of private citizens who commit minor trespasses like jaywalking, we should be focusing on uncovering trespasses committed by those in power. Say, the financial dealings of Xi Jinping or Donald Trump.