[rcfox]

It's not really the same as for horses. Horses in society lost control of their own reproductive rights. Horses existed to fill jobs because people bred them to meet a demand. As demand for horses declined, fewer horses were bred.

We have the opposite situation with humans. Individual humans retain their reproductive rights. Most of them don't decide to reduce the supply to meet a reduced demand. For a time, China did impose a restriction on reproduction, but that just resulted in many (mostly female) babies being killed or abandoned.

[SimbaOnSteroids]

I'm not sure having reproductive rights has any bearing on weather or not we can find jobs people are exclusively more qualified to do.

[rcfox]

The point is that the supply of humans doesn't track with the demand for them like it does for horses.

We will find something to do with humans because we'll be forced to. Humans are exclusively more qualified for existence.