We don't have the tech for two important, related things: user-friendly, trust management tools as effective as in person; key management for various, complex scenarios. These two have so many issues that even technical people screw up. I've certainly seen a lot of good work on these. Yet, we're not there yet and getting there is worth a ton of effort by anyone who will try.
We get that, then we might integrate it with our existing technologies to implement and use it. Need the foundation first, though.
It looks better than manual GPG but not quite there yet for majority acceptance. Need a lot more work on visual alternatives to this sort of thing. Whatever is mass market will be easy for them to mentally visualize and connect dots. Implies the solution will likely be visual (eg GUI).
We get that, then we might integrate it with our existing technologies to implement and use it. Need the foundation first, though.