Food production is always preferable to food storage long term, as you point out.
What I wish to point out is that the vast majority of people in America wouldn’t even know where to BEGIN producing food from 2 acres of land.
I’ll plant a Cheeseburger and French Fry tree right by my beer lake.
It's not just knowledge - it's also equipment. And for people who do know what they're doing - and have basic tools - - they'll lack fuel for machines - fertilizers for plants, etc.
Shoot, there’s too many people who think potatoes grow above the ground, like an eggplant. Or that owning a pig means getting free pork and sausage forever, without ever killing the pig. I had someone try to convince me once that gooseberries were poisonous. And another person tried to claim that you can eat any plant in the world “as long as you eat it slowly enough.”
Urbanites will eventually come looking, but I think the herd will be drastically thinned by that point. Unfortunately, it’s the most dangerous ones who will be left.