Under current interpretation, the Commerce Clause puts almost no limitations on the scope of the federal government's powers. Given that Raich affirmed the federal government's power to ban the use of medical marijuana in states that had approved it, I don't see how a Californian law decriminalizing marijuana for recreational use has a chance in hell of surviving. I personally feel that this state of affairs sucks and is an affront to the Founders' conception of federal power, but you kind of brought it on yourself by supporting a statist Democratic party and the activist judges they put on the federal bench...