How can you make it so after World War II, the Allies decide to inflict a punishment even worse than the Treaty of Versailles on Germany as encapsulated in the Morgenthau Plan?
For those who are not sure of what the Morgenthau Plan entailed:
https://en.wikipedia.org/wiki/Morgenthau_Plan
There were very compelling reasons for the allies not adopting and not enforcing the Morgenthau Plan.
The moral reasons were that the economic consequences of the Morgenthau Plan would have caused the death of tens of millions of Germans, as Churchill stated. And if he stated death, it was because the logic of the Morgenthau Plan was not to enable tens millions of Germans to emigrate and live somewhere else than the geographic area that had then been Germany. The western allies wanted to do nation building in Germany and uproot the warmonger imperialist tendencies in Germany to make Germany a liberal democratic society, not to suppress Germany.
The economic reasons by themselves were that the US and Britain wanted a ravaged continental Europe to be rebuilt and to reach again a level of prosperity that were beneficial both to continental Europeans, the US, Britain and the rest of the world. Keeping Germany into an economic ruins field would make much more difficult to reach this goal.
The strategic reasons were that as early as 1943, the US and Britain knew that the war was won, that the USSR would dominate eastern and central Europe, and that the next « match » would be the rivalry between the West and the communist East. And they wanted to have the possibility to bring their majority share of Germany into their team to go through the coming cold war.
This being said, you have in negative the consequences of your what if.