Correct, by 2022 EV car pool is done unless CA extends it which I doubt in view of fastrak. By that time, EV technologies will be better and cost effective. Sedans like model 3 will be available for $20-25k range.
Until car pool rule is there, I will prefer lease as car pool is removed for pre-2017 cars. Once car pool sticker period is over, and when battery technology has longer life - say 10-15 years, I may prefer buying it.
Presently, 5%-8% drop every year the mileage range. The GM bolt I bought was 235 miles/charge rating, actually gives 200 miles/charge that reduces to 170 miles/charge by the end of 3 years.
When cars are coming to 500 miles/charge, then it is economical to buy and use for more than 8 years. We need to have replaceable batteries to extend the life term of battery car. IIRC, Tesla gives it,replaceable batteries, but delayed in delivery.
Technology is still evolving, that is why I prefer leasing (easy to go for new car).