He did hint at this, last year or so he gave a speech saying "Soon things will be different..."

The problem is the whole idea of killing the leadership and winning a war is silly Hollywood nonsense. Unless they have a fifth column of traitors ready to take over in the vacuum, all you end up with is a bunch of pissed off survivors looking for revenge. (Israel would know this though, so maybe they do have a toady coup lined up to take over Iran, same as Syria).