Nobody wants to shut down all the farming, just reduce it. For example, the Netherlands produces 250% of its own meat consumption. Since it's subsidized, the net financial gain is very low. You could say reducing the production to 125/150% of consumption would leave enough for local consumption plus a little export in good times or a buffer in bad times.

Unfortunately, big agricultural companies hired a marketing company to start a political party which claims to be pro local/small farmers, but is actually just pro big agriculture.