I really don' think that countries such as Germany and Belgium have quite woken up to the problem they have; and are just hoping it will all go away. The Brussels market is going on as normal this year and has been touted as an advert that everything is safe and normal when that patently is not the case. If it were, there would not be patrols of soldiers at the airport, with sniper nests on the roof. I don't understand how the Belgians can keep the law in place about not raiding homes between 2100 and 0500 (iirc) as it disturbs people. If they have the intelligence, then raid the bloody homes.
I've been to Leuven Christmas market this year, but am unsure if we will bother with the Brussels one, which is a shame, as I quite enjoy it. I don't things are over in Belgium or Germany by a long chalk, and I have no confidence whatsoever in the ability of the authorities in either country to deal with the threat effectively.