I'm not an attorney, nor do I play one on TV, but if CA issues an exemption, in this case in the form of SB100, then taketh away, wouldn't that be a "government taking" and we the consumer would have to be compensated. Similar to a municipality redeveloping an area and uses eminent domain to acquire the property to be redeveloped. It doesn't sound so easy to do, even though we're not talking about real property rights, but personal property. Eh, what do I know. Zip, zero, nada.
Maybe the car owners with the SB100 exemption need to hire a Sacramento lobbyist?