I think it is a mistake, if one commonly made, to imagine that German generals were of one mind. Some officers planned for a coup but hardly all of them did. Coups don't always work out how those who plan them might like.
Assuming the German generals pull their coup, what happens next?
Does the SS still exist in this alternate history? The SS does have a large and vocal fan club in our world, after all.
Now for questions inspired by my time here.
Do France, the new Germany, and Great Britain lead a crusade to crush the Commies in the Soviet Union? Will Japan join in this crusade, or will Japan eventually launch a suicidal war on the Europeans and the Americans?
Do the Jews still get shipped to Madagascar?
How long till Great Britain and Germany have atomic bombs? How long till they have jet fighters and bombers?
Just what does happen to Poland in all this?
Once the Soviet Union is conquered, will France, Great Britain, and Germany decide to take care of the final great bastion of communism and fascism, the USA of FDR and Lindburgh?