Wow! I just took one day off and you guys have brought this discussion to new horizons! For now, I'll just leave a short comment:
Honestly, I don't think it's a very real possibility. Don't laugh at my naivety. Much before things come down to any military stand-off like that, the Iranian regime will be struggling against it's own people. Only an ill-wisher of the United States might suggest an ambush against Iran. Such a war will have absolutely unpredictable impacts on the entire world. I think it's totally uncalled for, as long as Iranians themselves are against this regime. Attacking Iran will put the United States in the role of the aggressor, and will give the Iranian regime enough excuse for any devilish deed.
And there will be blood. Really. I rue to say this, but it will be a thousand times worse than Iraq.
I'm not a preacher. I'm not an unrealistic pacifist. I don't freak out at the idea of a war. But my crooked political philosophy goes like this: "If someone is screwing up, don't cut in his action. Just let him screw up all the way. If you go all-out against him, you'll make a goddamn martyr out of him. Remember JFK and you'll know what I mean."
I'm sure Obama's America is wise enough to be aware of all that. The most aggressive country in the world is not America. It's a 70-year-old mini-state located a few short steps to our west.