Even if all the municipalities suddenly jumped on board, even in the best case high-speed rail is a decade and a half off. It isn't a realistic solution.
California is messing up the HSR project by not getting SF to Gilroy and LA to San Diego completed first. Sacramento to Nowhere is a PR blunder for the state.
https://www.paloaltoonline.com/news/2015/10/14/palo-alto-bla...
http://www.smdailyjournal.com/news/local/high-speed-rail-met...
I'm not sure CA could do SF to Oakland by HSR in a decade.
https://en.m.wikipedia.org/wiki/Silicon_Valley_BART_extensio...