Also 80% capacity seems still quite useful for many other applications like grid storage. It's really only an issue when weight and space are at a premium. There will probably emerge a robust secondary market for used EV cells.
A guy in this submission was saying he would give 50% margin on his actual driving range for battery degradation. At this rate that would take over 600,000 miles to get to 66% of original capacity, and probably longer.
I agree that the secondhand battery market will probably be very strong, but it's also likely that the tail end of electric vehicles will be extremely long regardless. In older cars you stop caring so much about the little things breaking, and if the car still goes places, people will still want it. In all likelihood Tesla vehicles will still be going places for several decades.
