It's being worked on. Several groups are laying out the legal framework and getting ready to build up the cases and precedents needed to make it air tight to get the laws overturned.
The best thing gun owners in CA can do is to be pro-active. Keep watch on what the CA legislature is doing, call and write to your member of the Assembly and CA Senate whenever a new anti-civil rights bill gets into committee. If you can, get to Sacramento and go to their offices and make your opinions known. After a bill is passed, contact the governors office and urge that he not sign it.
After a bill is signed into law is usually too late. Too many gun owners whine and complain about the laws standing around in gun shops and at the range, but never bother to make phone calls or send emails or, even better, hand written letters in support of our civil rights. Imagine if 15,000 gun owners called an anti-civil rights legislator every week. Say each call takes 3 minutes. The comes to something like 750 man hours/week that the staff would have to devote to doing nothing but taking and responding to calls from gun owners wanting to protect our civil rights. As it is, I doubt that they get more that a few dozen calls or email a week.
There are over 35,000,000 people in CA. If only a quarter of us are gun owners, and I think that is low, there are at least 8,750,000 gun owners here. It is up to us to see our rights are protected. Not the NRA, not GOA, not SAF, but each individual gun owner. If we don't do that, we deserve to have our rights legislated away. Think what we could do if all of us were to contact our members of the CA Assembly and Senate, our member of the US House of Representatives and both our federal Senators at least every other week.