User blog comment:Sbh1fr/some speculation about "wish" spell/@comment-26952857-20160905233957/@comment-29248623-20160911082115

It's pretty difficult to grasp how that spell affects the NW as a whole. The very entry of players had already shifted the balance of the world and Wish-Upon-A-Star's near WCI power could really fuck up the physics and pre-established natural phenomenon.

My personal estimate is that any effects from casters of the spell would not immediately spread throughout the world and slowly progress through time. Kinda like how wild magic went into decline at the entry of players into the NW.