Then no wonder Iraq won't fight. They have nothing to fight for. Who will supply the ground troops - endless dead Americans and endless billion bucks?
The Iraqi army and the shia militia (......remember them?) will fight ISIL to defend the boundary line they desire. that line includes the Mosul dam, the air port and the dam just north of Baghdad. I don’t know about other places.
They can win these limited objectives especially with a few well placed bombs and Hellfires to help out. I do not believe the have the stomach to retake the Sunni lands north of Baghdad and south of the Kurds.
I see no reason to interject American troops as before. There is no reason nor desire to reestablish the status quo ante. however a partitioning along lines that are not yet firmed up is in my view a certainty.