It's so funny, we were talking about it with my wife yesterday, after watching a Youtube video, and we both agreed that someone else would have probably replaced Hitler. WW2 was a culmination of severals factors leading to it, massive ideological changes, global financial crisis, raise of national socialism across Europe and the world, and a lots of companies benefited from both side of the war, and thrived in this economy.
So another pawn would have emerged and took Hitler's role to fulfill the very same global agenda.