Why not reconfigure Haunted Mansion into a more New Orleans Haunted Mansion?
The ride is by no means outdated, but when you think about it, how does it belong in New Orleans Square? Yes, the facade is a Southern antebellum mansion, but would you know by looking inside that it belongs in New Orleans Square? All of it is simply a broad theme of haunted-ness. Hundreds of parks around the world have haunted mansions, so what makes this one different besides a few leaps and bounds in technology?
Keep the facade, keep the layout, but change the theme to better represent New Orleans.
Add a swamp with an animatronic alligator near the graveyard, a la the front of Rainforest Cafe.
Enter into the elevator, and be greeted by the voice of Papa Legba, a crossroads god found in Louisianan and Haitian Voodoo cultures. Since Papa Legba is the gatekeeper of 'the other side', he'd warn you of what lies ahead with a brand-new monologue.
Enter into the hallway, furnished with portraits of infamous New Orleans citizens (Axeman of New Orleans, Delphine LaLaurie, Jean Lafitte).
Instead of having Madame Leota in the crystal ball, have Marie Lauveau, the queen of Voodoo -- add jazz instruments into her spell as well, rather than the regular instruments (Goblins and ghoulies yearning to moan / Awaken the spirits with your brass trombone).
In the ballroom, have a jazz band playing, and enhanced and multiplied animatronics dancing. Make it one of the famous parties New Orleans is known for ... just with the dead.
Have the attic transformed into a room of Voodoo -- pots steaming and potions boiling as you pass by it, spells being recited, etc. In place of the bride, have a very fluid animatronic ghost chef be making gumbo with some interesting ingredients.
Finally, for the graveyard scene, jazz up the final number, and have the spirit of Papa Legba follow you home.
This probably won't be a well-liked post as I'm messing with arguably the most beloved attraction at the park, but I truly believe it'd be best for Haunted Mansion and the plussing of theme in New Orleans Square.