Because what I'm seeing is a pivot in exactly the other direction. Near urban centers you're seeing more 'specialty' farms like you spell out. These farms cater, almost exclusively, to the wealthy.
But out in the breadbasket, there has been an absolute crush of consolidation. Fewer, larger farms are producing the goods.
I argue that we're going to see (or rather are already seeing) the wal-martization of farming. Few, HUGE scale producers who work at a scale that is just so much larger than what we have now they can still turn a profit.