Everything you say is correct but it comes with a massive decrease in quality of life for the average person. Food will be 5x the cost, with less variety. Nobody wants to till the land anymore. Just like people 100 years ago didn't want to be hunters.
Are you willing to part with your smartphone and computer? I would bet not.
Why would I have to part with some of the cheapest things I own on a dollars-per-day basis? That's why GP mocked the comparison to smartphones.
That said, sustainable farming doesn't require very small farms, and it doesn't require more than 1% of the population to work on farms.
> Food will be 5x the cost, with less variety.
Highly disagree. If anything we'll see more variety because mass produced food has settled on a very limited set of breeds (both for plants and animals) to keep timing and yield consistent.
> Nobody wants to till the land anymore.
Yes, no-till farming has demonstrated excellent results
Also, a reference to population trends might be interesting. Nobody is wrong (I've spent my spring preparing fields) but could be close but actual data would be good. Meanwhile farms have been failing at increased rates.