Taking a preliminary look at California, it seems that it would have large swathes of narrowly republican suburbs in a duel with the less populous but staunchly democratic Los Angeles, with San Diego County and San Francisco deciding the winner. Lean D, but barely so.
I don't see San Francisco ever becoming a swing area, the Bay Area as a whole is actually one of the most economically left wing areas in the state and was one of the strongest places for OWS. Unless San Franisico undergoes even more rapid gentrification I don't see the city being anything but safe D.
Overall I'm somewhat doubtful that California will be that competitive in the future, unless the Hispanic population gets much more affluent during that time or some kind of water crisis pushes up utility rates and forces the poorest residents to leave the state.