This area seems to have a major confusion...
between encryption (making sure that others cannot snoop on my communication) and security (making sure that my system is not readily abusible).
The two are not particularly closely related, and definitely are not substitutes for each other.
In this brave new world I think we will see a lot of having 2 parties open up a key exchange, and then proceed to communicate back and forth with no other thought to security. Sample mistakes will be that an undue amount of your internals will be available for perusal by the person you are perusing with, and the old web cart mistake of entering a negotiation and then trusting the prices that the client gives you.
Cheers,
Ben
"... I couldn't see how anyone could be educated by this self-propagating system in which people pass exams, teach others to pass exams, but nobody knows anything."
--Richard Feynman