I am sceptical to putting to much emphasis on individuals. The exact form of such a movement might be different, but Germany would go through much of the same problems. Some other far right move,ment might arise, or maybe Germany would see a coup by a military man. There were far right movements in many countries, but structural properties of the countries were more important than personal factors fotr explaining were the movements suceeded. It´s not coincidence that such a movement happened in Germany and not in Britain. A communist revolution seems a lot less likely, as communists have primarily succeeded in areas where the states have been severly weakened (a point made by Theda Skocpol) or through foreign intervention (after WW2). It seems very unlikley that a movement based on the lower classes should be able to succeed in Germany at this point. Even after WW1, the state apparatus was too strong.