I would love for this to magically happen, I agree with what they are saying, I've lived in Orange county all my life and I see so much crud going on here that I can't control with my vote because I am outnumbered... it should go deeper than political partylines though.
But this split won't happen...Northern California needs our revinue, they would take this to the supreme court and we likely would have more taxes and so on... taxes I would be happy to pay if my vote would count again... is there a picture of the divided territory?  sounds like it would be very patchy.  I really think California's size works against us all, and I really think what Brown just did in internet sales tax-though having a good intention of shutting down loopholes-just screwed over a whole bunch of califorian small businesses (Amazon.com just simply dropped all its Californian affiliates so it wouldn't have to deal with our sales tax...more jobs gone, more businesses will move). 
I wish I could relive my reagan years this time with political understanding-what a wealth of success he brought.
If this gets some steam, I'll bandwagon along just to show everyone how tired we are of being opressed.