This doesn't achieve the density of subways, but it isn't meant to. In the cases of low-density areas, it solves the last-mile problem by bringing the vehicle w

This doesn't achieve the density of subways, but it isn't meant to. In the cases of low-density areas, it solves the last-mile problem by bringing the vehicle with the person on the sled. In the cases where it's high-density to high-density, the sleds can function as subway cars. The question in my mind is more of whether the perceived benefits from the improvements that Elon is planning in the process can be realized, and if they'll be enough.