The clan threshold has been changed from this, "Clans with a net weekly negative score of -1000 are disbanded" to this "Clans with a net weekly negative score of -2000 are disbanded." This should be active after cache flush and is brought about in part by this thread:
http://www.carnageblender.com/bboard/q-and-a-fetch-msg.tcl?msg_id=0039JW