The greenhouses are closing down because of unrelated reasons; they're not profitable with the current prices of natural gas. It's cheaper to import from the (disappointing) harvest in the south than it is to grow these foods despite the price increase, so there's no reason to waste money on greenhouses at the moment. The fruits and vegetables listed do typically come from greenhouses, so there's a good chance it has something to do with that.
Farmers don't want to leave to Germany. That'd solve the Dutch problem quite effectively, but you'll need someone to buy the land, and who would buy a farm ready to house 30.000 chickens if you can't keep get the license because of economic impact?
This is why the government is offering to buy out farmers on the condition they don't use the money to start a farm elsewhere in the country, but very few farmers are budging.
Give it a few years and I expect meat imports in other countries will become more expensive. The problems you're seeing right now are more likely to be the result of greenhouses shutting down because of entirely unrelated reasons.