The only card that will fall is giving Iran control of Iraqi oil and more control over oil prices. We are in a proxy war with Iran. It will most likely turn into a direct war with Iran a few years later if we let them take control.
We should TAKE the oil and not give a damn what anybody thinks. If our allies want a piece of it, that's ok. Anything to keep it out of Iran and OPEC.
I agree, and although there would be much wailing and gnashing of teeth the offer of selling the oil at a reasonable price to our "friends" would be quickly accepted.