I wouldn't trust those. Why would I?
The obvious fix is to remove the camera, period.
As you say, the real solution is to make it socially unacceptable to use them in public places. The appropriate tools are banning and shunning, not lights and sounds.
Of course, those devices aren't made by a company whose sole purpose is the total and utter destruction of privacy, which is where this idea perhaps breaks down for the Ray-Bans.