Re: Not very many
"FWIW, all but one are multi car households so only one is truly "all in" on electric cars."
Yeah, I think in the US, there's probably a very large market potential for multi-car city dwelling families by switching one of them to EV since most city dwellers don't leave the city that often and would only very very rarely need both cars at the same time on a longer road trip.
Actually, the same probably applies to many developed countries, but the US in particular for the geography and the "road trip" culture that's still very present. Less so in many other developed countries, particularly Europe where countries are smaller and more densely populated and you can barely drive 10-20 miles before coming across another city, town or village likely to have charging facilities.