"Bismarck never gets forced out by Kaiser Wilhelm II; Bismarck's ideas continue to be used" seems to be an idea that is rolling in my head for a while.
In that timeline, Bismarck isn't forced out and his ideas continue to be used even after his death. I am predicting Germany has a less aggressive foreign policy due to Germany's foreign policy becoming more aggressive shortly after Wilhelm II pushed Bismarck out. Wilhelm II made the alliance system worse and aggravated World War I. I could definitely see World War I becoming much less of a world war (instead being reduced to a localized conflict between Russia, Austria-Hungary, and Serbia) had Bismarck stayed on for longer; without World War I becoming a world war, the German Empire would not have been replaced by the Weimar Republic.
No Weimar Republic and war reparations means that the Nazis have a much more difficult time coming to power. This might mean no World War II as well. Economically Germany would not crash (at least until the Great Depression).
Is this a feasible possibility? How could I better develop this timeline?