In 100 years, will progressives or conservatives be in charge? I don't know, but I'm pretty sure that whatever spying apparatus we put in place now will still exist (or be enhanced) by then.
I cannot for the life of me think of a way this policy would be enacted without a strong religious based push. I understand you think that it is unfair to claim that this is caused by religious based policy-making, but how can you claim that "you could easily substitute items from the other side and end up in the same place". What other side? Atheism? Can't see an atheist caring about this subject enough to create privacy invading laws. Religion always seems to be focused on what people do in the bedroom more than any other subject. Absolutely sex-obsessed.
China with there developing demographic issues will use a less religion based policy and more of the social shaming policy, and already are an authoritarian government.