To fucking where??? These are the most densely populated parts of Germany. With this map the only realistic solution for Belgium, Netherlands and Denmark is to set up extermination camps for 30-40 Mio. Germans.
I'm not an expert, but I'm pretty sure the number of Germans in the annexed areas would be nowhere near 30-40m -- probably around 10, or less. France and Denmark wouldn't have to expel all or any of their Germans, just Belgium and the Netherlands. So we're really talking about not many more people than Poland and Czechoslovakia expelled.
Don't forget that Poland had several millions Poles expelled from the eastern regions whou could settle in Silesia and Pomerania - and except for the Upper Silesia, these have been thinly settled, agricultural areas.
Czechoslovakia didn't, and the Sudetenland was thickly settled.
And what would then Belgium, Denmark and Netherlands do with territories containing a lot of housing and industry but no-one who would take care of it? They don't have an excess population who could take possession of the newly acquired areas and infrastructure. This scenario would require these countries abandoning their own core territories if they want to do anything useful with the German parts. Or accepting that they have enormous lawless wastelands - as big as the "core" territory for B ad NL - within their borders. It might work for the Czechoslovakia because what they annex on this map is mostly forested mountains with a few small towns.
That's definitely true. It would pose significant problems for Belgium and the Netherlands; they probably would have to be forced to go along with the plan by France, the UK, and the US. The first two, especially France, would be the ones most pushing for it. I'm not sure what would bring this about, perhaps:
A nuclear-armed Germany that takes out a couple Allied cities before losing.
No Cold War (for some reason) means that the West and East feel no need to prop up their respective Germanies.
Ouch! Now THAT'S destroying Germany.
Why did Austria get southern Bavaria? Did the "Hitler's first victim" theory prevail?
Yep. The goal is to make the successor states of Germany as small as possible. Rather than give the land to Italy, Yugoslavia, Switzerland, or Czechoslovakia, the easiest thing is to give it to Austria and make sure that it's firmly in the pocket of the victorious allies. It will, perhaps, feel indebted by its being given southern Bavaria, and the Allies will make sure to encourage the first victim myth and discourage Austrian association with Germany and identification as Germans.
Double ouch! Where would they send them to? Is there enough room for everybody in those 4 tiny German states plus Austria? Even the most staunchly anti-nazi postwar German will certainly resent these arrangements.
I think there is enough room, but just barely. It would obviously piss the Germans off, but this would only occur in a scenario (see above) in which no one cares. If there is no Cold War, the West might see the biggest threat to be, not Communism, but an again-resurgent Germany.
This would probably end badly for everyone involved (certainly for the even more Germans being expelled), and it's certainly quite unlikely, but I think both an attempt to carry it out, and its (at least immediately) successful implementation, are remotely possible.