I don't like being a grumpy Luddite on such matters, but when it comes to mass transit people are always pointing at shiny new technologies that are superior because, well, they're shiny, and they're new, and they remind us of life in the world of the Jetsons so they must be awesome.
The biggest issue is generally taking the "mass" out of "mass transit." The fewer gross icky other humans around, the better.
