But given that it only applies to a limited geographical region with free movement in and out not restricted it is unclear it will have the desired effect. This policy needs to be at the state or national level to be effective.
It would be better to have a coordinated response on this. But as a wise leader once said, “You go to war with the army you have, not the army you might want or wish to have at a later time.”
It's not about a specifically bounded result, it's about being either a flatter curve or a taller one. The more people act in the interest of flattening the curve is the benefit.