Arbeit Macht Frei, right? Is that you position? Criminalize poverty and institute penal slavery? Is that your answer? I grew up on a dairy farm and quite honestly, the automation is not much different now that it was fifty years ago. You still got to get the cows in the parlor. You still got to clean the teats. You still have to hook up the milkers. And you still have to do it twice a day, seven days a week, 365 days a year. No days off.
And while I won't argue with your 92% number I will point out that mechanized picking is for commodity crops, like tomatoes used in tomato sauce. But the tomatoes you buy in the market, the bell peppers, they are hand picked. Strawberries, hell, all berries, that are purchased fresh, are hand picked. And from my experience, not a one of those pickers is a native American. My sons did that work through the summers and learned Spanish in the process. They also made more money than any part time job they could have gotten. So it is not a lack of pay that keeps Americans away, it is a lack of work ethic.