I have not read Greenspan's original comment - but it doesn't take a financial genius to say that a financial collapse is imminent sooner or later. He did not say when :-) - anyone can make such a open prediction
I think we must read Allen Greenspan's comments in the light of his past performance; also what kind of bosses he has been serving. May be he is trying to scare the people so that Obama does not withdraw the Stimulous Package prematurely.