Less than 2% of the US's population works in agriculture. Nearly 20% live in rural areas. We are no where close to the point where we need to worry about having too few people living in rural areas to be able to grow food.

Those farmers don't need any network around them then? Just farms and more farms? Who does all the non-farming stuff in your vision of rural areas? Noone needs a plumber or a dentist or a schoolteacher?