Springfield and Wizarding World both take up spots they don't really need to. Then again, they also don't really utilize Super Silly Fun Land properly or Dino Play.
I imagine Walking Dead will move Waterworld over to the right side and it'll stay that way until a new attraction makes room.
However if ANY attraction or show is killed in the process (Mummy, Animal Actors, god knows what), then those spots are freed up again.
So ask yourself, what's more likely: SLoP or a new show opening BEFORE or AFTER something else currently open gets the axe?