A better question is what if he waited to invade Poland in 1945 when the Kreigsmarine and the Luftwaffe would have been way, way more prepared? Another question is what if he never turned on Stalin? Stalin liked Hitler and would have enjoyed steamrolling the Brits together.
I do love the tactical side of war. I can see many ways the Germans could have walked away with all of Europe. Then, as stated in Hitler's second book, America would come next. By the Hitler would probably have had nukes and America might not have.... Or maybe both would get nukes at about the same time...
Oh well, speculation is kind of a waste of time!
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