Right -- but if Iran is really this dumb I'd move out the troops tomorrow and prepare for the destruction of the Iranian army. Don't look a gift horse in the mouth -- all we need is a pre-emptive invasion by Iran. The world hates those things.
They aren't that dumb
That's the way I see it --- Iran moving in would just cause the Iraqis to kill many of them. The mullahs would be biting off way more than they could chew but it could rid the world of the crazier Persians who want to go fight and die in Iraq.