37% of cars in urban areas are parked on the street. There's a whole separate question about why so many people in urban areas have cars of course.
The direction of travel is that it will be uneconomical to keep a petrol car in London in 10 years time, even if they were still available for sale, so it's fairly meaningless. People will have to adapt.
" People will have to adapt"
I think that's a particularly unhelpful way of framing it, when actually we are trying to help people adapt new technology.
"it will be uneconomical to keep a petrol car in London in 10 years time"
Just means that people will hold on to their old cars, because they can't plug them in - and be a bit poorer. Now, if "people will have to adapt" means that there needs to be a massive effort to provide in-street charging infrastructure, you might be right.
I'm currently sitting in a terraced house in East London.