Nothing like a little common sense in the mode of sweetness and light!
There is a quote somewhere that 1/3 of the earths landmass is in agricultural land. A figure that should be enough to stagger the imagination, especially in light of John Brunners: Stand on Zanzibar. And farmers will produce foods, like tigger says, it's what we do best.
There are factors which are beyond the capacity of farmers to control. Fuel prices are a major one, climate variability, water, input costs like machinery and repairs, fertilizers and pesticides and seed, their own aging and their kids desire to not get into the business, and transportation, handling, processing,...... Ok so now I'm depressed again.
But Thank you for trying.