First, the media needs a sea change towards not making parents hysterical. We've seen this happen in waves ever since there was mass media (D&D, satanism, metal, gangs, etc., in my personal lifetime) but this is the first time I think it's actually caught on as a cultural standard for something like 2 decades straight.
Second, social media needs a sea change towards not making parents hysterical. I think that's where the 2 decades straight came from.
Since neither media nor social media will change anything that lowers their viewership, that means the audience needs to reject the hysteria. That leads me to the third thing.
Third, California needs to explicitly adopt play outside laws, and free range parenting needs to become the normal standard in Hollywood movies that -don't- involve kids falling into drugs or other trouble, and -don't- portray the parents in question as overwhelmed or neglectful. As a country, we seem to take a lot of our impression as to what's "right" from California, particularly for parenting and other age-related things, irrespective of local laws.
I think CA adopting the laws may happen eventually. They don't conflict with our normal legal standards for parenting. I think it'd just have to be an explicit and well-publicized adoption to spark much of a landslide elsewhere, much like with CO and recreational cannabis.