As cool as that term sounds, I'm not sure I like it. I think it's too strongly reinforcing of ideas like superiority of rationalists over non-rationalists. Even in cases where rationalists are just better at things, it seems like it's encouraging thinking of Us and Them to an unnecessary degree.

Also, assuming there is a good enough reason to convince me that the term should be used, why is transhumanism-and-polyamory the set of powers defining the non-muggles? LessWrong isn't that overwhelmingly poly, is it?