There was a 100+ year period of relative peace and prosperity after the conquest of Constantinople, just like today where Western Europe has had a period of peace and prosperity after the defeat of Nazi Germany. The revolts began when the Ottoman Empire entered stagnation and decline because of warfare with Europe. It has nothing to do with ethnic and cultural conflicts, it's all economic and political and it always has been. The ethnic and cultural dimensions of the conflicts are merely set dressing for deeper structural causes of war.

Now that we have entered our own period of stagnation and possible decline, be prepared to live in Interesting Times.