Horses don't strive to be employed and humans don't worry about the horse employment rate, either. I don't understand why the comparison to horse-unemployment is so widespread, a horse is an outdated technology in the current context, not an unemployed worker.

Because it lends itself to humor and compassion more easily than the casette tape / CD one.

It didn't augment the horse, but it sure augmented the jobs of the courier and chauffeur.

The automobile didn't, true, but the wheel, the cart and the plow (among others) did, for thousands of years.

So the question is, are we more likely to be shackled with plows, or replaced and only seen for gambling on at a race track :)

You're more likely to end up as a source of cheap meat and hides.

Hey, all that surplus capital enabled the creation of the modern pet food industry. Great example!