Here's another interesting POV from Antiwar.com.
Knowing nothing about war, the neocons probably expect any Iranian response to be symmetrical: an air and missile counterstrike. But Iran cannot do much that way, and surely knows it. Why shoot a few ineffective missiles at Israel when you have two juicy targets right next door, in the form of American troops in Afghanistan and Iraq?
An Iranian riposte in Afghanistan probably would come slowly, in the form of a guerilla war in that country's Shi'ite regions. That might also be Iran's response in Iraq, where it already has Revolutionary Guard troops in Shi'ite areas. But there is another possibility. Under the cover of bad weather, which winter often provides, Iran could strike suddenly into Iraq with several armored divisions. Our forces are scattered throughout Iraq, and they cannot mass rapidly because Iraqi guerillas control the roads. With skill that is not beyond what Iran might manage (the Iranian army is better than Saddam's was) and a bit of luck, they could roll us up before American airpower could get the clear weather it needs to be effective. America would not only lose a war in Iraq; it would lose an army.
Last Exit Before Gasby William S. Lind