If for some reason, we had as many horse riders as drivers, none of that would be true. Horses would be as much a part of modern industry as chicken and cattle

If for some reason, we had as many horse riders as drivers, none of that would be true. Horses would be as much a part of modern industry as chicken and cattle already are. IOW, there would be huge enterprises to ensure only good genes went into new horses, enterprises to ensure a steady supply of fodder to keep the horses of megacities fed, proportionately larger sewage system, and so on.