Settle down, settle down! Some pampas grass growing on those driveways in Caliland by the sound of it.
Seriously though, I think this is a quite interesting idea and the notion of ceasing to own expensive assets but instead paying for use each time is the way a lot of things are going. How far they will go in any particular domain will depend on various factors but the development of a tech-enabled (probably app-enabled) business model will be crucial (just because we can't imagine what that will look like for 'Cali-share' is no matter - few people saw Airbnb or Uber coming either).
We on this forum membership are obviously predominantly people who already have a Cali, and who therefore by definition can afford one, and I'd predict that as a group we'd tend to be resistant to the idea of sharing our pride and joy (I have to admit I would). So T4WFA you're probably asking the opinions of the wrong bunch! Run your idea past a bunch of twenty-somethings who couldn't at this stage of their economic lives afford to own a £50k van outright... and if they're urban hipsters they have nowhere to park one either.
Although they might be more excited by a Bay-share than a T6-share scheme.