[PlunderBunny]

David Brin's 'Earth' novel (which feels very prescient in some ways) has elderly people wearing sunglasses that continuously capture live video which is monitored by (private?) security companies. If I recall correctly, in the novel this effectively eliminates street-crime.

[stickfigure]

We already do this with dashcams; when the form factor allows, I expect it'll be just as common for walking. For mostly the same reasons. It might actually improve city street life.