Remember the great blackout of '03? People in New York were seeing the unfettered stars for the first time. They were afraid that the stars had something to do with the blackout. Superstition, fear and ignorance still run deep. I also recall that vast amounts of food were lost. Stores were giving meat away as fast as they could. The entire dairy and meat departments of every store in Metro Detroit were stripped. Fact was you couldn't get milk for about 48 hours. We were 24 hours without power, but it wasn't localized. Everything was down. The whole city ground to a halt. There were not enough refrigerated trucks in town to save the food. And if you had one, you could barely move it with the traffic signals down. The loss just in Detroit amounted to millions of dollars.
That was 24 hours. What if it was a week, two weeks? How long before the lack of food and transportation started to starve people? We would quickly strip the stores of the dry and canned goods.
The main problem with being in the urban environment is yes, few people have the skills of hunting and farming. They are skill sets, as much as engineering or doctoring.
The second problem is density. The sheer number of people mean that even if you have the skill set you might not live to practice it. If we had six hours warning that the East coast would be hit, we could not get the people out. There are not enough roads. In a technological collapse, urban centers are death traps. 80% of the people in the US live in those death traps.
I do not think it unreasonable to state that people currently living the nontechnological, subsistence life are better prepared to live it that pampered city dwellers. Remember, that life is a skill set as well. The Indian farmer behind his bullocks is as smart as you or I, he is not an ignorant fool. He knows the rhythm of the land he lives on, what crops to plant and when to plant them. How to care for his cattle, and a hundred other things we do not know, but would need to know.
Take a look at your fellows at work. How many of them have the skills to get behind an ox drawn plow and make their own food? Can you milk a cow? Can you hunt?
Ideally we bring the entire world to a "developed" state. How much more food could that Indian farmer grow with modern sustainable methods?
The days when a nation could out populate it's neighbors are over. We need to leave that idea and that game behind. Better we cannot afford the game at all. The Nation of Man, that is a goal to be aimed for.
We would be better off making sure every Chinese family had a refrigerator. Increase the Chinese standard of living and their population will fall off. It happens every time.