Even then, it's not going to make it to Larkspur until later, phase 1 only makes it to downtown San Rafael (but there's supposed to be a free bus from there to take you to the ferry).
As someone who lives in Santa Rosa, having something that connected directly to SF or BART from up here would be awesome (even if not really feasible). My brother lives here as well and he commutes to the Embarcadero for work. I'm not jealous, I already have no time. An extended commute would be the end of me.