This would truly be a great boon to many fields. Sadly, I'll bet it won't be long until the governments of the world start turning this kind of surveillance against it's own people en'mass. Right now, London England is the most heavily watched city in the world, followed by either New York or Paris, not sure which, but one of those two is in second place. Of course this kind of surveillance has it's advantages, like seeing a car accident and knowing who was truly at fault when the case goes to court, but, some people in London are currently trying to fight the system because they say it's a blatant invasion of their privacy.
I remember seeing a video a while back where a guy in London played a joke on local law enforcement by dressing up as an alien and pretending to "invade" the town to see how long it would take the cops to notice what was going on with their video surveillance and get to the scene. The reason he did it and is against the video surveillance is because he's proven that one of the street cameras sees Directly Into His Window when they pan the camera in his direction. If I was him I'd be pissed too and I'd definitely want the camera, at least that particular camera, removed.