re: Car share = norm?
I have a feeling the vast majority won't accept car sharing as the norm. Not for a very, very long time.
Too many personal, status, convenience, hygiene etc. factors against that ownership/usage model.
Might be viable in the centres of large, densely populated cities, but those places generally have good enough public transport anyway, such that cars not usually needed except as taxis. Which is pretty much car sharing anyway. With someone to (hopefully) keep it clean inside.