This actually seems like a fun idea. Let's turn it into a game. Here are the rules:
1. Bob Chapek has, upon hearing this idea, agreed that tossing out Pooh for Tiana is a magnificent idea. (They can always find somewhere else for Pooh.) He has put you in charge of the Critter Country project.
2. Bob's has two priorities for you to meet: first, you must remove Song of the South from the park. Second, Bob being Bob, you have to put an existing IP in its place.
3. This is more a reminder: with Tiana taking over Pooh, Splash Mountain is now boxed in between Tiana and Haunted Mansion, making Critter County into a de facto New Orleans Square extension.
4. Bob, being a corporate machine, will not accept leaving Splash Mountain as is. Now that he's in love with Tiana taking over Pooh, Splash has to be rethemed with a different IP or he will just tear it down and replace it with an entirely different ride.
I'm curious how you, or anyone one else who wants to play, would thread this needle. Or how many of you would relish destroying the mountain to save it.