Which is likely coming one way or another anyway.
Yes, ISIL has been successful. We can kill everyone but they have no achieved their purpose. Religious divisions within Syria and Iraq. They are now deep and wide, and revenge in the ME is as old as time.
Blood feuds last forever.
Iraq will split into a loose Federation. 3 entities, Kurds, Sunni and Shia.
If I was a minority religion I would move to where the Kurds run the show.