dutch is compulsory from 10 to 12. In every single school.
then we have the choice between dutch and english( and german ), and most of us choose for dutch, as surprising it may be for you! I remember watching a tv-program somes months ago, and it wa said that for the first time since the new school-organisation was established ( in the seventies ), english became first-choice for second language in 2 out of 5 walloons provinces. Which means than in the 3 others, dutch was still the first choice.
Sure we don't speak dutch as well as flemish speak french, but saying that we don't speak dutch at all is exagerrating.