Still kind of confused with the jargon (what then does commoditizing demand versus supply mean?) But to be honest, what I think this all boils down to is that

Still kind of confused with the jargon (what then does commoditizing demand versus supply mean?) But to be honest, what I think this all boils down to is that GM created a service that was not high in demand. IMO car sharing just isn't that high in demand as ride sharing.