Guys, first welcome to Abii
Second, don't derail the trail, what many of you are conducting is mere speculation and hypothesizing.
You can't compare let's say Hezbollah with AQ or Taliban as they are two different constitutes. Hezbollah is a nationalist-islamic movement, while the latter two are extremist islamist movements, and have different backgrounds and ideologies. Not to say that none of the three movements represent the general shia and sunni division in Islam. They are just a political product of it.
I believe that if Israel attacks Iran, official Pakistan will be put check mate and hence must stand on the sideline, what the average joe or should I say mohamed or ali from pakistan does is a whole different question.
I am not an expert on Iran, but what seems pretty obvious is that the Iranian society is divided. Some are pro-"regime"/current system, some are pro-West and some are neither. Iranians do not speak with the same voice, as some would like us to believe, they never did.
The people in power today are more or less the people who were left outside and persecuted when the pro-west system was in place. So by replacing the current system with a pro-western one you would just replay the whole scenario.
I am for changes in Iran's political system, as I really don't like the way things are done there. But at the same time, I wouldn't like to see the kind of system that US/Western iranians, excuse me PERSIANS, want to install. I saw an iranian woman here who was asked by the news why she was demonstrating against the current system, and she said that she wanted the Iranian women in Iran to be able to go to clubs and get wasted and have boyfriends. I mean is that really what you are fighting for? plus I don't like especially US iranians who weren't born in Persia and yet insist they are Persian, are strongly anti-muslim and anti-arab and are more western than the westerners themselves (they try to hard).
I need to tell my italian friend Giovanni that he should call himself a Roman from now on and my turkish friend ozgur an Ottoman and me I am from now on a Canaanite.