[Inconel]

I believe a large part of Northern California's, and by extension Silicon Valley's, water comes from the Sierras. The communities of the Sierras, as well as those of the Central Valley which separates Northern and Southern California, tend to be fairly conservative. They also have high rates of firearms ownership. I don't think they would be too keen to join in on a hypothetical SV secession.

[M_Grey]

It would be a very short, very ugly civil war essentially.

[Inconel]

I agree it would be ugly, I'm not so sure it would be short though.