Bad assumption.

Food production is a ticking time bomb just waiting to explode. Increased production depletes the soil of minerals and decreases nutrition levels. Also, it is increasingly concentrated in monopolistic corporate hands which will have the means and ability to wring every last ounce of profit out of a critical product that every human must have --- even more so than shelter.

It's possible to live in your car, a tent, under a bridge or even in a cardboard box --- but not without food.