Thus far this ruling only affects Dover. However, we live under the 'precedence' of a ruling, so won't be long till somebody finds commonality of descent from this case and the gnat strainers will use this case as precedence in what ever school they can.
Good. I hope it does spread.
Creationism should not be taught in public schools. If parents want their kids to learn about God, then they can pay for private schools.