In the future car bodies will be made out of carbon nano-tube construction which will be 250 times stronger than steel (no shopping cart dents basically) and 50 times lighter in weight, which will lead to incredible fuel efficiency, or battery charge per mile and thus, also better performance too.
This long-lasting carbon based material will also last for a long time, so rather than throwing the car away when you are done, just take off the body and trade it for the new body style of your choice.
» Read more: Future Car Body Switch-Out Trading Scheme and Life Time Chassis Considered