Could have won the war if all the men and resources that were put into the Holocaust had been used on the main war effort instead. It also would have signalled by not being hopelessly insane to perpetrate the Holocaust that Hitler's personality might have been stable enough not to interfere with the battlefield as well. Not wasting the army away in all those ridiculous hold-or-die last stands would have allowed them to build up some fairly significant defense lines that the Soviet advances couldn't penetrate.
Good thing he was nuts because his insanity meant his works had an incredibly short life span. A few more ticks towards normal and some vestiges of the sons of bitches might still be lingering around today.
