Agreed. The sphere of trust around each of us will shrink back to only those in our physical proximity. Outside of that, no one can be trusted.

I have no idea why you'd been downvoted. Everything you said is common sense. I guess this is a case of "it's hard to get a man to understand something if his paycheck depends upon him not understanding it."

Right. It's the same debate about how long authorization cookies or tokens should last. At one point in time--only one--authentication was performed in a provable enough manner that the certificate was issued. After that--it could be seconds, hours, days, years, or never--that assumption could become invalid.