Ottoman Empire would have modernized and industrialized like OTL under Ataturk and Turned into Constitutional Monarchy like Great Britain
Ottoman Empire would have been called a UK(Great Britain) of the Middle East and Arab, Jewish, Armenian, Kurdish Areas would be Devolved similar to Scotland, Wales and Northern Ireland
There would have been Less Problems in Middle East than in OTL
Iranian revolution of 1979 would have been Butterflied
9/11 would never Happened and War on Terror would have been Butterflied
Middle East Would have been More Richer and Peaceful