Second, I doubt these will be flooding the streets any time soon., but yes eventually when the cost is lower and technology is more matured.
Third, we're already being filmed by corporate America. Door bell cameras, car cameras, people's phones and online image/video services, and just general corporate surveillance.
Sadly the cat's out of the bag so to speak and aside from wearing anti-recording clothing I don't think there's yet a practical way out of being surveilled.