As I interpret this, the California ruling is a rather hollow victory. They'll just ammend the constitution. Further, few if any states will recognize same sex marriages that do take place in California in the mean time. If they cross state lines they aren't married anymore.
The federal Defense of Marriage Act prohibits the federal government from recognizing those marriages for any reason so, even if they stay in California, it won't even help them when they file their federal income tax.
As judges throw out state defense of marriage statutes, states will just be compelled to ammend their constitutions. I say that because it's generally considered undesireable to ammend a constitution. They aren't much good if you change them all the time and there's risk to letting legislators in there. So, when a proposed ammendment is redundant to existing statute, it's often voted down.
That's why, their only real hope is to work on the kids. If enough people grow up seeing same sex marriage as just everyday stuff, some future generation of voters will let it all happen. This campaign is taking place in our schools and involves a whole different set of proposed legislation, activist teachers/administrators and moves like the recent "gay rights day of silence" that was supported by some schools. Peer pressure works on kids.