rationalfrummie,
There is no way to know if what you write is true. Maybe if the bulk of Europe’s Jews were in Israel, Hitler, yemach shemo, would have poured more of his resources into Rommels forces in the middle east and the Germans would have conquered E”Y (and wiped out even more Jews).
There is simply no way to know what would have happened had Israel existed a generation earlier. It might have been better but it also might have been worse.