What makes you so sure? I think that in the current climate people are just comfortable with who is pointing cameras at them. Once these cameras are really ubiquitous and in the hands of people who they do not trust, the laws on filming in public will at the very least be brought to the public's attention. We're not talking about constitutional rights here, so anything is subject to change. Except of course for our right against unlawful search (4th amendment)
I hear people expressing discomfort about these cameras frequently. And warrantless surveillance has, generally, been found to be in violation of the "unreasonable searches" clause, while privacy has been judged a fundamental right which is protected by the "due process" clause.What makes you so sure?