5B is probably too high an estimate, but there are somewhere around 1.4B cars on the road today. And around 288 million in the US alone. I'm not saying everyo

5B is probably too high an estimate, but there are somewhere around 1.4B cars on the road today. And around 288 million in the US alone. I'm not saying everyone on the planet should own a car, but I certainly wouldn't bet on this market shrinking any time soon.