Mina is right in that what is being proposed - among other things - is the basic elimination of 'marriage' from civil law. You can do it, but like going to Disneyland, it doesn't matter. You get nothing special from it - other than the wedding gifts and the eventual divorce.
In Cali most people due to the law, or not, are living in sin anyway.
And don't all churches choose who can, and who can not, get married in the church, and how they are to go about it. I can't go book a local Catholic Church just because I think it would make for a nice backdrop for the wedding photos, I like have to be a Catholic and be marrying one too I think.