I suppose that Dick Chaney knew what he was talking about when he said that additional attacks are inevitable. However, the threats may indicate that they are not ready to pounce yet, and are still in pure braggart mode.
I agree. I generally pay very close attention when Cheney and Rumsfeld speak. Cheney took that position very early on. I recall him saying that a more devastating attack on the U.S. would happen where even more people would die. I think he made a statement to that effect just a couple of days after 9/11.