In talking about friends with this, one interesting divide was between people with kids and those without.
People with kids, especially suburban ones, seem to use the vehicle as a sort of mobile operating base. So the car isn't just a taxi. It's where the kids' sports stuff goes. Plus the folding chairs for the games. Plus snacks and water on hand. Plus it gets used as a storage locker when they're out somewhere. And it has assorted useful stuff, like charging cables and wet wipes and sunglasses and spare napkins and and and...
So I expect fractional ownership will not be particularly popular for a lot of people because a) they're already used to owning a vehicle, and b) they don't want to have to take everything out of the car all the time.