I should probably listen to the whole talk, but I'm too lazy so I'm going to assume it's about retraining people.
He said for IT jobs you must "think and analyze and that is a whole degree level different . . . you have to have a whole lot more grey matter."
I don't see how farmers don't have to think and analyze. Farmers manage the farm and finances, oversee production, procure equipment and animals, hire and supervise laborers etc. Also, I think planting, cultivating, and harvesting crops is a bit more complicated than he says.
In the past, guess what happened to bad farmers--they and their families died. It required a lot of skill, foresight, and intelligence.
I'm not going to deny most IT jobs require more grey matter, but I think farmers with the requisite Bloomberg grey matter can't do it for a simple reason: their education, life-experience, and work-experience have prepared them to be--farmers. Once you get to a certain age, it's incredibility difficult to learn new things, especially things that take years of education and work experience.