Speaking for the US, but as long as Monsanto and Tyson make money selling the food their farms grow in the cities I'm not worried about a John Galt-style "strike" of agriculture. Doesn't make the existing system fair or right (it's honestly disturbing to me how much agribusiness is centralized), but I honestly have no concerns about the rural food going away because the rural population is upset with the urban population.

Do you want roads in the country?

Do you think people from the cities build roads in the country? Would you rather have your food shipped by air?

Do you think only people from the countryside pay the taxes that finance the roads? Or even mainly?

"Most people in food-growing regions are conservative, so we all must bow down to conservative interests" is a tiresome and ridiculous ultimatum that American politics needs to get past.

Obstetricians are strongly left-leaning. Do we need to bow down to them if we want babies? Should they get 5x the vote because otherwise women and babies will all die in droves in childbirth?

Most people benefit from and choose to participate in society, and in exchange each person should get the same voice as the rest. We don't need to grant them any special political status above everyone else in order to entice them to do their chosen jobs. If someone decides they won't sell food in a city that voted for Biden or deliver babies for people from a Trump county, great have fun with that. Most people are less mindkilled on politics and will fill in the gap.

I have no idea why people jump to this argument any time it's halfway relevant. It's... well, put it this way: do farmers want money?

Look, "liberal" Hollywood is largely conservatives at the top. Big farm owners & farm conglomerates aren't going to stop selling what people want just because they're mad that women can get abortions or they need a license for their semi-auto rifles or whatever. The almighty dollar rules commerce.