I3BrigPvSk
The Viking
This is certainly an interesting thought. Had Hitler somehow restrained himself from his desire for Lebensraum Nazi Germany might have been around for quite a bit longer? No dought the US would have gotten involved, but one can only speculate as to the outcome.
It may have been harder for the Allies to get a toehold on northwest Europe with the additional German forces that would have been available. As it stood the Allies drew away ~ (>15 to 35) % of the German forces - resources from the Eastern front (depending on what time period one looks at).
Some speculate that Stalin would have eventually attack Germany. However one has to look at the fact that Stalin also greatly feared Hitler. So this theory that the USSR would have eventually attacked Germany is hypothetical as well.
Maybe Europe had been close to how the book and the movie "The Fatherland" describes it.
I have also heard and read about the Soviet Union might have attacked the Nazi occupied east Europe. I think the Russians had attacked if they were severely provoked, but if the Germans didn't provoke them, I doubt they had attacked. But that is only a speculation.
Things like this is pretty close to the speculations about a war between NATO and the Warsaw pact