The quickest way to get dragnet surveillance banned would be for citizens to collaborate and create a massive publicly-available surveillance network.
Yes. Once the application of force happens outside the state's monopoly, they'll shut that shit down so fast.
Good luck getting permits to install your citizen flock in public areas.
... of politicians. Because they are the ones who could write the laws to ban privacy invasive solutions.
It's legal to film publically - what's not necessarily legal is what you then do with that.
There are already precedents - for example it's legal to film ICE agents in public spaces, it's not necessarily legal to use information to dox if that can be construed as harassment.
Even if you crowd sourced the identification of somebody involved in a potentially criminal act, you can only share that with the police and not the wider public.
The law is asymmetric here because the police have powers reserved for themselves to stop vigilantism.
Perhaps an interesting angle here would be if you can make the case that companies like flock are involved in harressment themselves...