The Constitution does not explicitly require the speaker to be an incumbent member of the House of Representatives, although every speaker thus far has been.
I like what Robert Anton Wilson had to say about conspiracies and their life cycles:
"[A]s far as I’ve been able to discover in all my years of being involved, more or less unwillingly, in this field, I cannot find any proof of any conspiracy that really existed, was really brought into court and convicted, that lasted more than ten years before everybody double-crossed everybody else and the conspiracy fell apart."
Miss you, Mitch.