Yeah, I doubt that. It takes .5 to 1 acre of potatoes to provide the calories for a family of four. Then there are the protein needs. A cow can handle that but she needs a bull once a year and anywhere from 2 to 10 plus acres. Taking care of all of this is a 2-4 hour daily job until the crop is set to in mid summer.
Then there are pests and water needs to deal with. And the fact that many places just don’t have the land, like most inner cities, period. Or the right climate.
People can raise tomatoes, peppers, squash, cucumbers, etc in pots if they tend them daily. This will provide all the vitamins.
And larger towns can stop mowing and rent out their roadsides and parks to sheep herders and goat herders if push came to shove but the increase in herd size would take 2-5 years and a long term commitment to the herders - like 20 to 30 year leases to make it stable and doable.
Urban hunters who can sell their game would be another. And this can be increased tremendously by planting mast and productive browse but it takes decades to get this going.
Ultimately the market must be allowed to work. Rise in food prices will lead to increases in both land planted as well as improvements in productivity. People can certainly eat less.
Modern Ag began when the Spaniards embargoed the Dutch and the local Dutch farmers got both property rights AND then began to raise their productivity due to high food prices with limited land.
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