BART ridership to airport fails to take off

From SFGate SFO / BART ridership to airport fails to take off.
This is consistent with a lot of research on megaprojects. See e.g. Pickrell “A Desire Named Streetcar: Fantasy and Fact in Rail Transit Planning”. Journal of the American Planning Association 58(2):159-176,
and Flyvbjerg Megaprojects and Risk