I have a huge 32A commando connector thing on the outside of my house.
It runs an electric kiln but, while you're there, why not make it a permanent and swappable fixture so you can use it for other things in the future, building works, etc.
But, unfortunately, it would be bog useless for even standard charging of an electric car the way I use mine. I'd just about be able to use it for the little electric moped that the other person who lives in the house would use incessantly (they're Italian, though, so...)
Given that that one device can pull more current than ANYTHING ELSE in the house (even a boiler or cooker), and that even that device is not sufficient, I can see no reasonable alternative that people can use. The wiring here is actually quite good, I pity those people who don't have modern wiring though.
You're basically talking about a significant portion of people who currently own a car having to upgrade not only their fuseboxes / fit electrical points etc. but also upgrade their incoming feed entirely (and so the electric company will demand new meters, checks, etc. along the way). That's an incredible expense.
The alternative is that petrol stations become charging stations, but then you are stuffed if your battery does die while you're on holiday - you need a tow to get it going. And the queues are going to be horrendous if you have to wait 20+ minutes per customer, unless you literally have five times as many charging points as you did petrol pumps. Which just adds to the problem.
I can't see it happening any time soon. I doubt they'll ever reach their petrol-car cutoff dates. I foresee an endless pushing-back of that date. Especially as they get no tax from it, but have to pay a fortune to provision for it.