Hopefully Facebook will be forced to stop tracking everyone. After all, it's very hard for Facebook to refuse to track ONLY a certain region. After all, how does Facebook know the difference between Belgium users, and non-belgium users? I could be a Belgium user as far as Facebook knows.
As for everyone outside of Belgium (and possibly those in Belgium, again Facebook doesn't always know where you are), I strongly recommend blocking Facebook from your browser. You can do so using Privacy Badger, certain ad blockers, or by modifying your pc hosts file.
PS: how much do you want to be that Facebook will be allowed to continue tracking users while they argue privacy in Belgium's appeals courts?