Taking into account the complete failure of current "Artificial Intelligence" (really it's just statistics), the amount of rice (the most common staple on Earth) needed to feed a decent sized population, and the way most governments get in the way of progress even when they think they are helping, I would estimate that the world you've described is between 200 and 2,000 years off. On the upside, your Steem balance will be pretty huge by then!