[eksith]

The ease of use has to approach at least Skype level (and even then you'll exclude a wide swath of users who don't know how Skype works).

There's an old joke about Unix to the effect of "it's not user unfriendly; it's actively user hostile". Likewise, many aspects of PGP, E.G. key generation and management, web of trust, public key validation and keeping the private key secure that is utterly befuddling for the vast majority of people. This, despite the fact that it's one of the most accessible avenues for secure communication we have right now.

If people have things that are easier to use securely, more people will be secure.