But the ultimate loser of the power struggle is clear: the Iranian populace at large, as all of the viable factions are quite committed to consolidating their power by repressing the population. The most likely situation, I think, looks a lot like Libya.
This is not at all how Irani society is structured.
The rest of your comments generalizations are weak and ill-supported as well, at best they only apply to a subset of Arab countries in the Middle East.
The well-established succession processes practiced in the West guaranteed that at any given time, not only was there almost always at least one person who would benefit directly from the ruler's demise, there were often individuals for whom the ruler's premature demise was required for them to be inline for the throne. If you're the King's brother, for example, under male-preference primogeniture you need to make sure your brother doesn't have any kids.