While pondering the price/value equation (with a realistic 18-24mos purchase timeline for reasons I've explained elsewhere), a recurring question has been: Why would I ever need to replace the car? For my current ICE vehicles, the potential answers are obvious: frame rust, engine dies, transmission fails, accident, outgrow/change in desires. With the exception of accidents and "falling out of love" with a Model S, the other reasons seem irrelevant/not applicable. I could foresee needing/upgrading a battery-- or even the motor-- but those seem like fast and easy changes, if not inexpensive ones... but beyond that, could it be that Model S is as close a "permanent car" as we've ever seen on the market? Owners: What would cause you to sell or replace your Model S?