Nio already has a service to swap to higher capacity battery if you want to go on a long road trip etc. It prices its cars according to battery capacity so even people that chose lower capacity car on purchase still have the option to swap to a higher capacity battery. Though I think the main use for battery swap technology will be for commercial trucking and if I recall correctly Chinese government and OEM are working on standardisation for that so all those truck batteries are swappable no matter which company builds the battery.