>> one doing the job ten use to.

> This would increase employment ceteris paribus.

This might be true, but if it is, the one "doing the job ten use[d] to" would not actually being doing the same kind of work at all, and so therefore might not be the same people or even same kind of people. Even if we do Jevons ourselves out of this situation, it might still spell employment disaster for mid level coders, while increasing employment for product managers.