The problem with that line of thought though, while people generally expect/wish for private communication, few actually care to understand the mechanics of it. Nor should they have to, that's what security engineers are for, to do all that archaic setup so people can just use it without having to check certificates and protocols and all that stuff.
I'd say that if we could just have a simple to use, no-click pgp style system things would be good and we no longer have to keep nagging people to set things up the 'right' way, but so much of the hassle comes in by people using 100 different communication platforms.