So those who got a car pre-2017 are blessed with free eletricity.
Those who used to swaptheir car each year (the rich) won't have reason to complain too much, they spend $50 annually on their daily before maintenance and energy anyway.
Will people who are too late be left pissed they missed out on free SuC? Well, Tesla might dissuade the competition a bit by starting to let their customers benefit for the reduced cell production cost. The battery portion of the cars could become much cheaper. S60 could drop $5-10K, on top of eliminated free unlimited SuC. Upgrade to 75 could get cheaper also.
And the new 120kWh (or whatever it'll be) could simply replace the 100 for the same price. Losing the free unlimited SuC which for those who drive a lot, represents a good amount annually.
Really, once the 2170 cells are produced in numbers, the new 120 pack should cost Tesla well less than today's 100. So giving +20kWh for free would still net them a margin increase. And their margin on loaded cars is class leading already.