I just think that the Iranians know that US cant fight a new war right now. It lacks the resources. This time they would have Iraq and Afganistan to launch the attack. But it would take months again to build the invasion force. This is months to get prepared for the other side. And i wouldn look too much on the Iraqi invasion, they didnt really fight back. Divisions surrendered when Generals were bribed and there was poor morale generally. I bet that the Iranians have more will to fight back and are better equipped/trained than Iraqis. . This would cause a lot bigger casualties and that would brake the US back morally not militarily. They won the battles in Vietnam but lost the war.
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