2016-17 It is all about milk

Here is an article from the NYT: How Dairy Farmers in Belgium Held Up a Big E.U. Trade Deal.
It describes opposition of Wallonian dairy farmers to CETA: the Comprehensive Economic Trade Agreement between Canada and EU.
What is interesting about it? The agreement will have little effect on dairy farmers in Belgium, since Canadian dairy is protected and so Canadian producers are not competitive. Also, Canada accounts for 1/500th of Wallonia trade.
So what is going on? There seems to be a significant trend away from free trade. The opposition of Wallonia is one manifestation of it.