All of that fresh water will not help Arabs be anything but Moslems and Arabs. That combination yìelds poverty for the great majority and oulence for a tiny stratum of rulers. It has been thus for 14 centuries and has not changed even with oil wealth. The Kurds brand of Islam, at least in the last century seems to allow for development, even prosperity. Because of that they will be anathema to Arab Sunnis and Shia and to Persian Shia. But remember, Saladin was a Kurd and spread the same terror and destruction that ISIS is spreadinging now.
Saladin was a Muslim, yes. But he wasn’t radical. He’ll probably execute ISIS elements in his army. Remember 1,000 years ago, the Muslims were quite enlightened.