I don't believe USA is going to let the oil in middle east go, it's like saying Mexican Cartel to let the weed money go. Oil it's not only for consumption but if you control oil market you basically control the world economy. USA not worried about running out of oil which they are not ( they are drilling Canada ) but they are worried about growing China and East pacific. China can not grow if it gets limited by consuming oil. Iran is the main source of oil for China and USA doesn't like that. USA with the help of Saudi Arabia made everybody pay with US dollars when they buy oil now Iran is receiving gold instead of US Dollars, That is the main reason Kadafi's government got demolished by NATO with their terrorists friends help in Libya because he wanted Gold Dinars instead of US Dollars not because he was a dictator, what about Saudi's government then? why they don't get bombed? they are not very good with human right stuff neither but they are USA close ally that's why they didn't get bombed but Libya did because they wanted to break this power chain which actually broke themselves.
USA will not back up from those oil, USA is also have an eye on Venezuela oil and Natural Gas in Azerbaijan and Turkmenistan. USA really love to control the oil in Iran once again and that is the main reason they are pushing the civil war in Syria not to listen to UK and France. UK and France know they have nothing to say in Middle East with USA presence they are targeting Africa again for their gold, silver, Uranium, platinum, and oil.