"H'mmm how fast to reposition out of Baghdad, or we are drawn into a fight in Baghdad and Iranian's cross the border into Iraq. They are just fanatical enough to try that, especially with their recent "defeat" of Israel."
I would think they'll use a nuclear weapon on Israel first and are preparing for invasion afterward. By the time they would even reach Bagdad their would be nothing but burned flesh and shrapnel remaining. If they use nuke on Bagdad, they then face the entire world minus Russia and China.
You have more faith in "the entire world" than I do.