Yeah, it was decriminalized because jaywalking was a crime invented by the auto industry and there's no real harm in it, provided that a person crosses a street when it is safe to do so (this is part of the new law, it's still illegal to cross when you cause a risk of crash).

On the other hand, traffic rules protect public safety. Even and automated enforcement (provided that there's no entrapment for revenue, something that is dangerous and does happen with, e.g. red light cameras) causes people to have safer driving habits. After all, driving is not a right, it's a privilege to operate heavy, dangerous machinery in public. Drivers should be held to a high standard of safety.