Transit needs critical densities with which to operate. The car system fails under heavy load but works in sprawl because it's individual vehicles going places. But the sprawl is economically unsustainable.
Current transit rail models fail because they need higher densities than we've built at. It works great in dense areas like the northeast. We don't have the densities for it in places like South Florida. My suspicon is we'd need a massively-revamped bus service to really provide mass transit here. Subways can't work, we're not dense enough.
Do they work in Tokyo? Yeah. They're built to that density.
I'm in South Florida. We have Tri-Rail. It can't do the job. Our only other option is private vehilces. It fucking sucks. But we're so heavily committed to low-density sprawl, we're painted into a corner. How do we fix this?