I presume you care about the nature of the Iranian gov't because of its impact on the Iranian people. If that's the case, you should check how sanctions are affecting the people of Iran and in general what outcomes regime-change sanctions have produced around the world. Cause it may turn out that the sanctions hurt the people you care about a lot more and for a lot longer than the gov't you'd like to see gone.

Also check under what conditions better governments emerge out of worse ones. Hint: it tends not to be under severe sanctions.