The way you would want it done is as long as you own the car you pay some annual fee for battery swaps but then you can swap whenever you want. You would have to sign up at the point of sale for the service and not be able to situationally opt out whenever you weren't driving long distances with a desire for swaps though, because the idea is that you subsidize the fact you never need to "replace" your battery now and Tesla needs to keep up battery stocks with some fraction of the cost each year.