Even if you manage to get your government to never do this, it is (or soon will be) easily within reach for private hobbyists.
My window faces a major freeway. I could probably rig up a license plate reader that registers all cars going by fairly cheaply. If not now, then surely in 5 years.
Everyone has a quite nice camera in their pocket. The car I bought last year comes with 3 cameras. And so on. I think it's an unavoidable fact that in the very near future, you have to assume you are being filmed whenever you're in public.
So I think the real question is: How do we adapt to this new world? How can we limit the bad aspects and enjoy the good aspects? Are we really sure what is bad and good?