The best way to discourage its use at this point is via the courts. Declare facial recognition inadmissible, and its use will drop off. Not a fan of bench legislation, but keeping this out of widespread use is really, really important.
>Declare facial recognition inadmissible, and its use will drop off. no, they will just use it for parallel construction instead
I didn't say it's a perfect solution. But it might at least help.