Org-mode can be used without being an emacs geek though. The wife of the friend of mine who first showed me emacs and org uses it as a self-management / note-keeping application, and whilst she might be at least slightly geeky, she's not really a tech person.

Once I found out how much you can really do with it, I went on a prosetylizing spree and got a couple of friends as well as my little brother into it. Whilst they're somewhat tech inclined, they're by no means emacs geeks, but they got into it after me showcasing and explaining at least some of the features.

Personally, i think that the only thing that's really essential in getting people into it is a tutorial level to it, similar to interactive tutorials for programming languages (I recall a marvelous ruby one from a year or two back, but I'm unable to find it). Org-mode already scales beautifully regarding complexity, and i think the main thing that turns people away from it is that the manual is a literal textbook and only silly people study it back to back. Or that they're using vim and don't want to switch to emacs, but that's not likely the group of people you're targeting.