Astralis,
You state the fulfillment of three requirements to necessitate war with Iran. A viable and sovereign Iraq coupled with a nuclear-armed Iran would not, however, necessitate war under your criteria. It appears that you are prepared to acquiesce to an Iranian nuclear weapon under less than immediately catastrophic consequences to Iraq. WTF?
I'm not worried about the Iranian gov't hastening the imminent return of the "hidden Iman". I do worry about nuclear-induced regional leverage within "...the known rules of power politics."