I'd settle for blocks put on any call with a forged originating number or caller id. I suppose that would be some mandatory government prescribed equipment upgrades. Not sure how that would be perceived. There's probably some lobby that insists they need to make number and ID faked calls.
To give the US government some credit, they did come up with the do not call list, which worked pretty well for a while. They've also fined a few of the miscreants. A few times they've solicited input from the general public for advice on a fix. Recently they ruled that nomorobo is not violating any laws.
I suppose with terrorists blowing things up and shooting civilians this isn't the governments highest priority.