You're looking at it the wrong way. Hitler was into bluff & bullying. Look at the sequence. Remilitarize the Rhineland, Anschluss with Austria, the Sudetenland Crisis, finally a lightning war against Poland. Meanwhile Russia was attacking Finland, absorbing the Baltic Republics, and finishing off Poland through the back door. It wasn't until Britain & France declared war on Germany in support of Poland that these events crystalized into a world war.
Don't misunderstand. I'm not blaming WW2 on Britain & France -- far from it. What I'm suggesting is that Hitler may have miscalculated what Britain & France would do in response to his invasion of Poland. After all they did exactly squat in support of Czechoslovakia.
The bottom line is that if things had gone slightly differently, the German General Staff's warplan timeline might have worked out.