Of course they'll extend it soon to hunting squirrels, rabbits, and other small animals, when it's discovered that the Condor, and other carrion birds, eat even more of those.
Even now, the technical challenge to this is pretty high, since they can't do like the waterfowl hunters and use steel, that would be an "armor piercing" round, as would most any metal much harder than lead. Bismuth with a plastic coating? Lead free ceramics? Deplete Uranium with a lighter metal core or cladding? Of course it has to be soft enough on the outside to "grab" the rifling, and not so hard as to cause excessive wear on it. Big challenge.
Anyone have any information on what is being proposed for big game and coyote hunting in CA? Of course the people who enacted the ban don't worry about little things like that.
The legislation has tasked the executive to come up with regulation by 2010 to implement the intent of the legislation. Best guess is that when Fish and Game is done, center-fire, lead ammunition will be verboten from Los Angeles to Monterey Counties along the central coast.
Example: Lead was banned from waterfowling sometime ago but when F&G appeares at the hunt, the sportsman plays hell explaining possession of lead shot near a waterfowl reserve during pheasant season.