When the horse was outcompeted by tractors it meant at the same time that the horseman was replaced by a tractordriver. The productivity grew and new workplaces were created instead of the old ones. But when a tractor is outcompeted by an autonomous vehicle, the tractor driver isn't replaced by someone else. That's one of the reasons why the consequences of the digital revolution can be different from the industrial revolution.
In 1946 there were 246 000 horses in Norway. On the photo from the Norwegian Museum of Hydropower and Industry above, a man called Asbjørn Eide is standing beside his horse. The picture was taken by Daniel A. Eide.