There’s a lot at stake. Ride-sharing, as an industry and a civic utility, is too big an idea to be left to a company like the one Uber is now. The company that wins this industry is bound to become one of the world’s most powerful corporations. Its executives and culture will indirectly shape how we build cities, how we use energy, how we employ and pay people. We will entrust it with the safety and the security of our families, our streets, our private data and even, conceivably, the nation.