It would seem that counties and cities must still justify that the no shooting areas present a"reasonable likelihood that humans, domestic animals, or property will be jeopardized".
I would think that any County that were to declare a wide area such a no shooting zone without justification would still be running afoul of "State Preemption".
What I would like to see is the Legislature apply some meaningful penalty to violation of State Preemption. Making the officials that push for violations, such as Former Mayor Nickels in Seattle's park ban on firearms, personally liable for their actions. Ditto for those on City and County Councils that vote FOR ordinances that they know full well violate preemption. They do so for two reasons. One is they know there is no personal penalty and second, they feel that once these ordinances are enacted they hope they will be able to convince the Legislature to "exempt" them.
It's just like raising kids. Tell them that certain actions are not acceptable but don't punish them when they break the rules, then see what you get in the end.