Unfortunately, they don’t have to be very successful to have an impact. Even just their introduction to the marketplace normalizes the concept, just a bit. Google Glass failed and so have other camera-equipped glasses, but notice that they keep popping up. Look how many companies have made them, and for how many years. Collectively, it’s moved the needle. I know someone who uses them regularly, mostly for recording rollercoaster rides, but that’s still plenty for a surveillance company.
Facial recognition is becoming common enough that it’s no longer very surprising if you’re in a crowded public space. Malls argue they need it to catch thieves, airports argue they need it to catch terrorists, and so on and so forth.
Privacy is like Humpty Dumpty, except he’s being poked to death.