“Couldn’t survive without subsidies” and “perfectly capable of feeding itself” are somewhat contradictory statements — it’s not as though these farms will go “off the grid” in this scenario. Once they can’t pay their bills, the bank comes and takes the land — and now the farmer can’t even do subsistence farming.
Meanwhile, all the giant agricultural conglomerates continue to feed the cities, because they want to stay in business.
All of which ignores that 20% of the food consumed in the United States is imported (as though cities can’t import more and outlast the farmers?)
The idea of a farmer’s rebellion is cute, but in application it would never work.