Sounds like another reinvention of the wheel, the "email" part of http://retroshare.sourceforge.net/
Dismissing or deriding a project because it is not completely novel is unhelpful. Since 'retroshare' hasn't taken the world by storm, maybe that wheel needs to be reinvented.
Of course, if you want to talk about "taken the world by storm" as in "Microsoft Windows 95": You're right, no encryption software has ever taken the world by storm. And that has to do with the fact that the general public doesn't care about privacy, b/c they have no clue how it works and most of all what the mid- and long-term consequences of losing privacy will be for their lives.