Video cameras no longer need to be aimed, the way you're thinking. Gigapixel camera arrays mentioned in the article make it possible to do wide-area visual surveillance, and storage! So, find a person of interest, and then rewind the last 20 hours of their video.
We need to consider the difference between ephemeral / archived (and searchable), not just public / private.
We're talking about a single organization having access to 24-hour video of every street in the city, with the ability to select and rewind every car and every person. It's fundamentally more powerful than public video snippets.