Even the latter statement has to be hedged, unfortunately (e.g., see the Dust Bowl), though it is more often the case. It really comes down to sustainable vs. unsustainable practices.
I would think that they manage their farm land as an investment. It isn’t easy to move to a different area due to labor, equipment, investment into the ground, etc.
If anything, I’d expect a small farm operation to easily relocate should the land become less productive.