If you are in the market for a new car, this support page is definitely worth your time. One particular thing to look out for:

Some automotive wireless chargers have physical size constraints and might not fit every phone. If you’re planning on buying a car with a wireless charger, make sure that your iPhone will fit in the charger first.

To me, this is an obvious place where car manufacturers should offer a user-replaceable shell, so when you move from one form factor to another, you don’t end up with a sad face and a phone that no longer fits snugly in place.

As is, I suspect that manufacturers will force you to bring your car in to replace the Qi-charging shell if you switch phone types, if they even have a shell that fits.

Anyone have a car that offers Qi wireless charging? Ping me, if you know how the shell swapping works.