A possible unintended consequence of this could be that registered sex offenders may start blowing off their obligation to report their whereabouts. In droves. It is already difficult to effectively enforce the registration. If a large portion of them decide that, for their own safety, they would rather violate their parole and fade out of sight, then the chances of maintaining any oversight over their proximity to past victims, potential at-risk locations such as schools and youth centers, and even employment at places that possibly expose them to future victims is out the window.
Failure to afford a reasonable expectation of personal safety to registered sex offenders is just asking for seriously dangerous and unwanted side effects.
This system has got to cost quite a bit. And as noted, it lumps very high risk with very low risk all together. No sense of proportion to the system.
I wonder if it wouldn't be better to spend the money on a)longer incarceration and b) bird-dog supervision of the really dangerous ones.