After the recent Belgian elections I'm starting to wonder if the Belgian Federation is going to be around much longer. With Flanders' growing economic and political power (and Wallonia's need for Flemish subsidies) I wouldn't be surprised if Leterme severed the link entirely.
I doubt it would follow the Vlaams Belang model (even though VB took 20% of the Flemish vote) but I wonder how such a breakup would occur?
Would the predominately francophone population of Brussels be granted citizenship in a new Flemish State, or would they become displaced Walloons by default? Maybe something in between? This is, of course, assuming Brussels became the capital of Flanders (it is within the border of the Flemish Region, afterall). I assume Namur would become the Walloon national capital city, as it currently is the regional one.
What relationship would a Flemish State have with the Netherlands? Though they share a language, they have stark religious and cultural differences. How would a Walloon State relate to France?