I don't know the end game here. It's easy to say that phone calls as a medium just slides into oblivion and this all becomes academic. But I don't really believe that. There's a real and continuing place for voice conversations and that requires someone to initiate a call.

Eliminating spoofing is probably impossible without infrastructure revamps that aren't realistic even augmenting with spam filtering at the telco level. But the current situation is at the edge of the tolerable and people will just stop letting calls ring through.