The more a car costs, the less frequently it's replaced – usually. Take, for example, the Bugatti Veyron. It's one of the most expensive cars on the market, and it's been there for eight years now. Eleven years passed in between the launch of the Ferrari Enzo and that of its successor LaFerrari. Now comes word that the Rolls-Royce Phantom could stick around essentially unchanged until the year 2020.