Actually apocalypse did come-- in the last century there was mass starvation in Russia, China, Ukraine, Ethiopia, North Korea and more....literally tens of millions of people starved to death within living memory. Plus, large scale factory farming is not necessarily the economically optimal way to farm. We can't know because the US and other governments MASSIVELY subsidize factory farming...the market is extraordinarily distorted. Even further, there are questionable regulatory burdens foisted on small farming operations.