Should it happen? What do you mean "should"? It is days away from happening! You assured us it was right around the corner years ago! Why is it "should" now?
No, they won't. Cities control the air. They control the majority of food production, which goes against common sense but is true. Hell, California produces more than half of the country's fruits & vegetables, and a lot of that is produced within a short drive to major cities and not in rural areas like most people assume when they think of Kansas wheat or Oklahoma cattle.