Or they can make it modular so that the battery/framework can quickly and easily dropped out and replaced. Front wheel drive cars are designed such that you can drop the entire engine and transaxle out of the vehicle in a couple of hours for easy access/replacement.
When is the last time a major manufacturer designed a "disposable car" where one component failure is intentionally designed to render the car irreparable? Manufactures could have been doing this for decades but they know it won't work because customers won't come back.
