I know you're making an analogy but I have to point out that there are many points where Nazi Germany could have gone a different route and potentially could have ended up with a stable dominion over much of Western Europe.

Most obvious decision points were betraying the USSR and declaring war on the US (no one really had been able to print the reason, but presumably it was to get Japan to attack the soviets from the other side, which then however didn't happen). Another could have been to consolidate after the surrender/supplication of France, rather than continue attacking further.