If I understand you correctly, you are looking for an AG Opinion on the Constitutionality (4th ammendment) of CA PC 12031(e)
In other words, as narrow a scope as possible...
I'm certainly not even remotely an expert on what will happen, but essentially there are only two outcomes.
1) He agrees with existing case-law that a legislated inspection doesn't violate the 4a - similar to Smog Checkpoints
2) He says it violates the 4a, and instructs the 58 DAs to disregard prosecution.
My gut says that he would side with existing case-law. For all I know, its possible that he's actually bound
If he were to actually side with us, uninformed LEOs are still fully capable of arrest if you don't submit to the inspection until their qualified immunity is pierced for that issue.