The economy is shit. No matter who will be in charge, they will fight an uphill battle.

There is one example in recent history where the reinstallation of the monarchy went great (=as well as it could): Spain. The monarch let the country slide from a dictatorship into a constitutional monarchy. One that decided to pull the veil of silence over the crimes of the old regime but still a democracy. So let’s hope the possible return of the Shah follows the Spanish example more than anything else.

I don’t think anyone can predict what will happen in Iran. My gut feeling is that a collapse of the current regime will lead to a fracturing of the country, something like a civil war between moderates and religious fundamentalists. A mix of what happened in Libya post Gaddafi, Iraq post regime change, and Syria post Assad. The overthrow of the mullahs will only be the first step.