I mean, have you seen what they're doing to the Jungle Cruise?
Haha, I didn't say I was surprised, I'm merely expressing concern.
That said, it's possible an asinine "Let's all help Louis find his trumpet!" storyline could mitigate the potential damage of the re-theme. We know modern Imagineering tends to overdo it with "story" -- perhaps a loose premise would allow the visual humor and AA animal musicians to shine, and the ride could be a lightweight, jazzy journey down a wild river, as opposed to a 95 minute movie crammed into 4 minutes of poorly-paced show scenes.
That said, they can and should think of something better.