Horses are great animals and people love working with them. They have social ordering and it's fun to talk to people who really know them. You don't even pick up the social cues and they translate "horse did X, Y, Z". Or take coal mining. It's unbelievable how tightly a group of men holds together if they've been underground for years. Mechanization and automation has removed many of the horse and coal miner jobs regardless.

We still have horses today. We still have coal miners. We'll still have human models. There'll just be less of them.