Based on time to charge vs time to pump gas, let's be charitable and say you need 30 minutes to charge an EV fully, vs. 5 minutes on a pump, so you'd need 6x the number of publicly available EV chargers to replace an existing gas station.

On my regular UK route, the motorway services have petrol garages that can fill 20 cars at once https://goo.gl/maps/wF7dxup3jBMAGqjg9, and only 6 EV points: https://goo.gl/maps/GXm2xoPNvXGZiMxU9 and they're always occupied when I pass through.

I'm sure every car park will eventually get more EV points, never one per space though, but we're not there yet. We're not even at 6x the gas station pump count yet.

I'm sure I'll be in the last group of people to buy an EV.