The fundamental problem that i have with all this is that i find it almost impossible to believe anyone could be so stupid. Yet it has all really happened. Iraq and Syria is largely a hollowed out military hulk that cannot be reconstituted in any appreciably way. It just takes way too long and the culture is not yet, it ever, supporting the process.
The practical solution would be for the Turks to march in and occupy it all as an interim measure that then leads to a Sunni Confederacy at least and possibly a Kurdish Free State as well. The Turks at least have practice here and they may then be able to assist in setting up the Kurds as an ideal buffer with Iran as well.
We are simply not getting the Iraqi Army back any time soon and the Shiite version is popcorn. Yet a Turkish army would clearly end all pretensions among either the Sunnis or the Shiites. It would also bring pause to the Iranians as well.
At the same time, the Turks need to come to grips with the continuation of their Kemal based modernization. This is proven possible mostly because most cannot read the Koran either..