This assumes that people will substitute their home gardening time with app development, doctoring, clothing production, etc. When, by my observation, it will be spent in a non-productive fashion. Not to sound like a Protestant, but this sort of work is good for the soul.

Also, I don't want to be dependent on a monocultured, government-subsidized, efficient conglomerate agribusiness if it's operations contain externalities whose price we could partially avoid paying simply by having a tarp filled with dirt and some potatoes and skipping one Netflix show a few times per week.