I only said “good chunk” because there are already more than a few reports pointing to a shift in behavioral patterns around calls. (Feel free to Google, Bing, or DuckDuckGo it when you have a chance.) The point is less about an exact percentage and more about the fact that user behavior has already adapted in ways that erode PSTN’s practical value.
And if the FCC were fully capable of solving this problem, I don’t think we’d still be here after decades of the same issues. That longevity itself is part of my argument: it’s not that people haven’t tried, it’s that the structural limitations resist a clean fix.
Also, IP addresses aren’t a great analogy. They’re not a sole indicator of origination — we have layers of metadata, routing, and reputation systems around them. I’d accept that comparison more readily if phone numbers were spoof-proof. But they aren’t, and that’s yet another area where the FCC hasn’t managed to close the gap.