Just to offer an alternate perspective: I go to the parks. I am not familiar with the Wicked movies or the musical. I have no idea what the story is. I know the Wizard of Oz movie and that's it. I don't know how many of us there are, but we do exist.
Now, on the other hand, I have no idea who Dudley Do-Right is either, but that doesn't hamper my enjoyment of the ride.