I don't know about "doomed", but ISIS is a lot more dependent on its allies to hold the territory it controls in Iraq than usually depicted in the Western press. The ISIS-Naqshabandi alliance seems to be a pure alliance of convenience. They both hate the Maliki-led government and that's about all they have in common. The more ISIS transforms itself from ISIS the insurgent army to "The Islamic State" with governing structures and policies, the more their alliance will fracture.
