Regime change in Iran?

Now that we know that Iran has a weapons site dedicated to creating nuclear weapons, Republicans are upset and demanding "regime change." As Josh Marshall points out, that does not necessarily translate into military action. But don't these people ever learn? Didn't our last attempt at "regime change" in that part of the world, and, in fact, next door to Iran, not really work out so well?

Naturally, these Republicans are disdainful of diplomacy. One reason for conservative opposition to diplomacy is increasingly obvious to me: they're not very good at it.