Is there anything stopping you as an individual or your party taking a case against this legal opinion?
Is any A.G. even going to imperil himself and his career while in office?
Would a S.F. Govt. even challenge the A.G. while in power?
No.
What's the worst case scenario for an AG who offers a legal opinion that supports the stance of those who appointed him? If found guilty of deliberately giving an OPINION that he knew to be at variance with the law (something extremely difficult to do about an opinion), the very worst that would happen to him is he'd get removed from the job that he wouldn't have gotten picked for in the first place if he wasn't going to play ball. No lose situation for him and his cronies.