Once we reach about 40% of vehicles being EVs a lot of petrol/gas stations in more expensive areas in cities will become non-vaiable economically - It'll probably happen quite quickly.

Gasoline vehicles will become more expensive to maintain and run, and more of a hassle to refuel, so even people like me who like to keep their cars for ages will be forced to switch a lot earlier than normal - especially if you live in the city.