Right now, I can't even use apps like Hiya that implement prefix blocking. My method right now is to forward ALL calls to a google voice number, and those are transcribed or what-have-you. If you don't leave a message, I don't care about you.
We need a signal, at the highest of levels to basically make the decision on what's going to happen to the phone network, because honestly, a brand new system is what I expect at this point, not a patch.