You don't spend 10 of billions of dollars to go to war for oil unless you plan on taking the oil rich property for your own, and that is not the case here. Keeping Iraq is not a part of the equation, and why would we bother with that ridiculously expensive method? If you want oil, you buy oil. If for no other reason, then you do it because it's cheaper that way.
Now you do go to war to ensure the free flow of something as vital as oil, but that isn't the case today either. There is no problem with the extraction, production, or distribution of oil from the Middle East. They may not like us very much, but they are very happy to take our money for their oil.
Yes this is a repeat of an earlier episode of
"Ronn says the war isn't about oil". 