The Sunni-Shia civil war was merely postponed by US intervention. There is a long overdue bloodletting about to occur in Iraq and the only questions are: (1) whether Iran is going to directly participate in support of their Shia brethren or merely provide arms, and (2) whether any Sunni majority country will come to the aid of Iraq’s Sunni minority. Time to buy oil stocks. When the Iraqi yahoos torch their own oil fields, prices will once again skyrocket.
Scenario 1 is most likely. And no, they won’t torch their own oilfields any more than Iran ever torched their own.