An FYI...if I'm not mistaken, BART incurs operating costs of about $800 million annually, of which half is subsidized by the taxpayers.  But the Bay Area has about 6 million people, and BART has about 100 miles of track.  Thus it may work a bit better there.

However, if you ever lived there, like I did for 15 years, it is a really expensive place, with high taxes.  Honolulu has nothing over that place.  For example, a one bedroom apartment ( 600-700 sf) rents for about $2,000 a month, higher if in SF city proper.