“Tractor” is a general term. Saying AI can run a tractor is like saying that AI can operate a computer. The statement requires more specificity.
Driving a tractor is not the same AI as driving a taxi.
In fact, for many operations, a tractors primary function is not driving at all; that is secondary.
It is also the case that there are many different types of tractors and each has a unique set of operational circumstances.
If we are a decade/century away from AI reliably driving, then we are 10 decades/centuries away from AI reliably operating most tractor operations.
Imagine then a world where everyone gets a default minimum salary
The most likely amount would be $0. But I guess I can be a bit cynical.