Slight correction. The Iranian Constitution designates the head of the Shiite religion as supreme authority “for life”.
So the 2nd in line of the Shiites will need some special declaration of incapacity by Khameini to take over — and continue Shiite policies.
Make no mistake here. This is the overwhelming majority. There is no wandering around hating their own government (that they elected last year). If you want policy change, you’re going to have to order professional military officers to kill all, as in ALL, the civilians — which of course are orders that will be deemed unlawful.
Oh, there’s another possible way. The Libya treatment: a chaotic failed state with various terrorist factions in constant conflict.
While the civilized urban ethnic Persians are the majority, there are various ethnic minorities and other malcontents in the hinterlands and border regions who could certainly stir up trouble, especially with help and funding from Mossad/CIA/MI6, which they are already getting.
Whether such a plan would succeed remains to be seen. I would not be surprised if this is one of the plans for the end game in Iran.