With the retaking of Mosul in northern Iraq, the Islamic State (ISIS) could soon be a thing of the past. But the defeat of ISIS and the demise of its self-proclaimed Iraqi-Syrian caliphate won’t bring peace to the Middle East, or even an end to the Syrian tragedy. Rather, it is likely to open a new chapter in the region’s bloody and chaotic history – one no less dangerous than the previous chapters since the fall of the Ottoman Empire at the end of World War I