Car dealers make their money from trade-ins, parts and service (new sales are often a loss leader to get you in for service work - everyone is driving for the best deal even if the dealer loses money), so the dealers at least care.

Car makers need to do well against the competition, and resale value is something that people look at. They want your car to last 10 years and then fall apart - that being about the time people start to be willing to call a dead car dead of old age. Though they do like having a few collectors cars that are a lot older than that around because collectors also feed into car culture.