The problem here is you're missing the middle steps.

As AI gets better and cheaper farm owners don't hire as many hands. Their tractors become more automated. The building do more with less supervision. This is already what we see, this is why we dropped from something like 50% farm employment to like 1% in the US. But when your employment levels get that low on non desirable jobs it gets very hard to find the next generation that will be the farm owner. The hands these days are much more like gig workers, it's very unlikely they'll buy/inherit a farm and work it in the future. The family of the farmers has all gone to college and is working in a city somewhere that can get an Amazon deliver in 6 hours rather than 4 days.

It's not that AI will even be optimal to manage, it will just occur with the massive consolidations that are continuing in farming communities.