It will potentially happen, but I think it might take a bit of time. Looking at history, most wars come with at least ten years or so within one another (give or take a few examples, I am not precise with that statement). Iran would be a very meddlesome opponent considering it is backed by several Islamic states and has had a history of wielding extremist faith in Islam as a social tool of building it's forces. I mean, during the Iran-Iraq War, they used children who they have blinded with faith in Heaven to run across minefields and destroy the explosives! I think that if we do go to war with Iran, it will be a war unlike the US has ever been in before. For one, it will be more technology and weapon-based. With the military industrial complex as big as it's ever been, we could be using not only our own military and equipment but military companies like Blackwater and DynCorp to fight overseas. On top of that, we would be dealing with a nation that not only is slowly developing nuclear weapons (or so the Feds believe), but are very much benefactors of the illicit arms market. In other words, it'd be another guerrilla war involving Kalashnikovs and RPGs. However, this is one of few times in the last 30 years that there has been a defined enemy in the international community. For all we know, it might go from sanctions and SC hearings to NATO and Israel backing the US front in Iran. But, with how poor our military is following Iraq, that is highly unlikely. Regarding the nukes, so long as there are a dozen or so nuclear-armed nations, Iran will think three times before even considering the big red button. Kenneth Waltz, known as the godfather of international realism, said that Iran isn't stupid. Despite the influence of extremists like Ayatollah Khomeini, Ahmadinejad would think twice about using nukes. In simple terms, Ahmadinejad is acting somewhat like a scared child - he will try to act tough and use drastic threats, but will not bring himself to do it. While only a theory, it could play out this way. Already, the EU, NATO, the US, and Israel are backing sanctions on Iran and could potentially be the first to hit Iran in the case of a worst case scenario.