Reactionary boomers in Marin county have been slow-rolling the regional rail plan (SMART) for decades. Don't hold your breath.
If SMART ever comes into any kind of decent service it should relieve a significant demand among north bay-to-sf weekday commuters. Note, however, that SMART service to Larkspur Ferry is "planned" and "phase 2" which means probably not in my lifetime.
Sounds like what they need is a train, tram or bus.