A trip to the grocery store takes 30-45 minutes. If even 20% of the existing spots had a charger (even a modest rate charge), you'll get quite a bit of charge. Or if 20% of the parking spots at your workplace had chargers, you could leave it on the charger all day one day a week and charge very slowly (which as a bonus, low-rate chargers should be easier to provision than superchargers).
My town has on average 1 car per household, but I'd guess like 0.25 off street spots per household. That's a lot of infrastructure on public land.
It's just an electrical outlet. There are dozens of them for every parking spot already, in the house/office/building. Adding an extra electrical outlet isn't hard for a homeowner/lot-owner to do. This isn't going to have to happen overnight. It will happen slowly over two decades.
Regardless though, you're correct that it will take decades, but I think that this is one reason why a CEO wouldn't be all in. If it's going to take 25 years for a large chunk of customers to buy an EV, you still have a lot of cars to sell that are ICE.
It's just a normal plug, maybe with some components related to metering and billing included. Load balancing if you want to be fancy.
There are just certain sections of the country where you'd either have to turn half of the streetlamps into a chargers (maybe a good idea?)...or make a modular battery swap gas station scheme....or stick with ICE.