Original 60kWh buyers were given an option to purchase unlimited supercharging for $2,000, while 40kWh were not given the option at all. All of the cars that did not purchase supercharging actually have the necessary hardware. Now that pay-per-use is implemented, it would be a great gift for the early Tesla supporters for Tesla to enable the ability to supercharge with the new pay-per-use pricing. This would give Tesla an ability to claim that the entire Model S/X fleet can use the network for long-distance travel. Tesla does not even have to put out any money for this, as no one would expect the 400 kWh yearly credit for these cars. There are most likely not that many cars on the road that still do not have unlimited supercharging, and their owners are used to not relying on the supercharging network, so the additional utilization of superchargers would be minimal. However, it would provide great value and flexibility of having no-compromise vehicles.