It is already coming suddenly in China. Beijing has a lottery for new car license plates for ICE cars, and the quota goes down each year. Not for electrics. More than half of new cars in Beijing are electric. Next, Guangzhou. Shenzhen is already all electric buses.
Apparently the chart shows only the number of permits handed out, not the number of cars actually admitted. (After you get the permit, you have a period during which you actually need to buy a car, if I read it correctly)
