If Belgium breaks apart, the small German speaking part might rather be part of Germany than of Wallonia. Also, that railroad that became Belgian after WWI while running through Germany was build back a few years ago and there was some consideration of returning the land to Germany at that moment.
As I have stated in a similar thread before, if there was really a huge demand by Austrians and Germans to unify in a single country, so far that it becomes the main political goal, it might be possible within the European Union, since one country would have less power in the EU than both countries individually. But that is very farfetched.
Everything else? No way
Gaddafi will not invade Switzerland and divide it among the neighbours.