That completely ignores the fact that most cars have multiple owners. If the average time to keep a car is 6 years, and the average car has at least 2 owners, t

That completely ignores the fact that most cars have multiple owners. If the average time to keep a car is 6 years, and the average car has at least 2 owners, that means it needs to last 12 years. But of course the carmaker doesn't have much of an incentive to car about people who buy it used. Maybe that needs to change somehow. Maybe some kind of requirement for much longer warranties?