You couldn't just say it's okay for all 50 states without mass confusion and bikes getting run down by angry motorists. You would need to implement slowly in states surrounding California. Places where cage drivers would have had the opportunity to experience Lane Sharing on a road trip to Disney Land. Nevada first, then Arizona followed by Oregon. You would need to do a year long public awareness campaign to inform the public.
Never gonna happen.
Be sure the safest rule is that we should not dare to live in any scene in which we dare not die. ~Lewis Carroll~