The point I was making is that, actually, it doesn't matter how many cars people own. They can only drive one at a time and car sharing doesn't reduce car mileage, just cars. Fine if you regularly buy new cars, but if you mainly drive cars that are 10 years old or more, which we do, and run them until they are only fit for scrap then any saving of vehicle or anything else is moot.
I think car sharing undoubtedly has a place in big conurbations like Edinburgh, where there is abundant public transport, a high density of households, and people are more likely to to work locally and cars are only needed occasionally. But in areas where house hold density is less or in small clusters and public transport is less frequent or doesn't necessarily go to the places people work so that people are using cars on a daily basis, it is just not practical.
It is the same with bike schemes. they work excellently in towns, but, again will not work in areas where household density is lower.
It is horses for courses. car clubs, bike clubs definitely have their place, but they require a lot of organisation and only work in limited specific circumstances. They are not a universal panacea.