Is Belgium gradually splitting apart?

Could well be. Maybe not least because

In 2004 the economic output per person in Flanders was 124% of the EU average, in Wallonia it was but 90% of the EU average. Today the Walloon business paper L’Echo writes that if Wallonia loses the Flemish subsidies, amounting to 3.3 billion euros, this would cost every Walloon 1,000 euros per year. Brussels, Belgium’s bilingual capital, receives 0.2 billion euros from Flanders each year, or 200 euros per citizen. Some Walloons suggest that if pro-market Flanders secedes from Belgium Socialist-dominated Wallonia cannot survive and will have to join France. 40% of the active population in Wallonia works for the government (compared to “only” 25% in Flanders) and 20% is unemployed (7% in Flanders).