After the remilitarization of the Rhineland, the Anschluss, the Munich agreement, taking Memel from Lithuania and the First Vienna Award were all accepted by the Allied powers, was it possible for Nazi-Germany to just stop pushing world tension and remain at that state for decades to come? In stead of invading Poland and causing a World War? Would the Allies have accepted Germany to stay in this shape forever, controlling Austria, the Sudetenland, Bohemia, Moravia and Memel?
The same would go for states like Italy and the Soviet Union of course, could they have kept Albania and Ethiopia, and Bessarabia respectively forever?
Adam Tooze, The Paperback of the The Wages of Destruction: The Making and Breaking of the Nazi Economy, addresses it. The book is well worth reading, and it is well-regarded here.
It is his opinion that the German state was financially unstable due to economic problems -- what staved them off was first seizing Austria's state assets and reserves, then Czechosolvakia's state assets and production capacity, then Poland. But each step was follwed by expenses necessitating the next step.
Further, he states that it was Hitler's belief that, because America was a growing power, Germany had to have a broad base with lots of industry and resources just to match it, or else Germany would be enslaved and destroyed. And the only land that was available to Germany was Europe. Further, there were a few factors that came together around late 1939 that gave Germany a little brief advantage. So Hitler concluded that at some point he had to fight or die, and that moment was better/less bad.