I actually thought the wand battle and demonstrations they do for the Celebration of Harry Potter could be done seasonally there as well if they wanted to.just leave the stage as it is and just put a harry potter themed magic show
have people in robes do magic tricks and maybe bring a choir to sing the theme of the movies and call it a day lol
Or strip the stage and move the Frog Choir and Tri-Wizard Rally here so the performers don't have to die in the heat/no more bottleneck at the castle.
Lots of ways to utilize the stage without much effort... until they bulldoze the whole land for something 5 or so years from now.
And I do think moving the Mystic Fountain to Port of Entry, maybe at the end of the street in front of the lagoon, would be wise, if they do bulldoze the land.