Until we get driverless cars, I don't see this disruption really occurring. Big cities are the only places with enough density to support car sharing, and they

Until we get driverless cars, I don't see this disruption really occurring. Big cities are the only places with enough density to support car sharing, and they already have low car ownership rates (low enough that if everybody switched to car sharing, it wouldn't be a disruption). Even assuming everything goes splendidly with Google's self-driving cars, it is going to take a long time to move from that to fully autonomous, driverless cars. This isn't going to get disrupted until the mid-2020's, IMO. On the other hand, using the Internet to efficiently aggregate low-use, high-cost resources is a great way to build a business. It is at the core of cloud computing, Air BnB, and (successful) Groupon promotions. I'm sure others exist as well.