In 1910, there were nearly 20 million horses , per Data Paddock. That number plummeted to under 1.6 million by 1974.

Why? Because new technology — the automobile — disrupted the transportation industry. rather than a form of transportation, which bode badly for breeders and farriers but well for auto mechanics and manufacturers. Those who don’t learn from history are fated to succumb to it, which begs the question: ? Earning passive income doesn't need to be difficult.

Admittedly, tech companies were testing self-driving cars 15 years ago, and everyone leapt to say, “Human drivers will be obsolete by 2020!” That didn’t happen, of course. But that doesn’t mean it will never happen. Self-driving cars continue to improve, and whether in 10 years or 20, it’s hard to imagine millions of Americans working as drivers once the safety record of self-driving cars exceeds their human counterparts.

Increasingly, travel agencies have become a luxury of the rich. Busy moguls simply dictate their criteria, and let an agency sort out the details. Those bespoke travel coordinators won’t disappear, but they also won’t serve middle-class vacationers.

There just isn’t the demand for it in an era where you can score the best deal yourself by hopping on Skyscanner or Airbnb. Likewise, printed newspapers and magazines won’t vanish entirely, but they’ll consolidate and become more niche. Stalwarts like “The New York Times “and “The Washington Post” will likely keep .