I agree with the Ninth Circuit that certifying this question to the California Supreme Court is a decent idea. No reason not to get a decision on this question straight from the horse's mouth.
But if I had to guess, I don't think that tribunal is going to agree with Judge Pregerson. My prediction of state law would be that there's no common law duty for a business owner to have an AED (Automatic External Defibrilator) on the premises.