One thing they will not put up with, all across the spectrum, is heavy handed government attempts to drive them out of business. They are stubborn, independent people. I've seen them shoot and bury hogs rather than sell at losing prices, even if in means they lose more by collecting nothing than selling.
How long do you think your centers of power in the big cities will last if they decide to start doing this on a large scale? How many of your "constituents" collecting welfare checks and buying drugs and booze have the expertise or even the ambition to run these farms if you send them out to take them over like your idealogical buddy Mugabe did in Zimbabwe?
Most farmers I grew up with can survive a very long time without anything from the cities. How long do you suppose the cities can survive without anything from the rural areas?