Only because our goobermint will tax the crap out of it to pay for socialist wet dreams like this one.
ALL these systems require massive tax subsidies. NONE are self supporting.
Willie is a serious head-case; for instance, I've pointed out in the past that we have 300 years of $25/barrel oil within the US, the whole restriction to it is political willpower. Willie just plugs his ears and shouts his "peak oil!" mantra.
I guess anything to keep his fetish for trains alive...