People are dismissing it for a variety of reasons.
For instance, I am dismissing it because of Disney's track record with rethemes (Mission BO, Incredicoaster, DLP Space Mountain, Frozen Ever After, Snow White's Enchanted Wish) as well as the information and images they are choosing to disclose.
The concept art looks bland. And concept art usually looks a bit more lively and exciting than what we get in real life. But these concept images seem to show a ride with fewer figures and visual interest as well as showing a thrill ride devoid of any danger.
Splash worked because it was whimsical and embraced the danger we feel with a drop. Same with TOT. Same with Maelstrom. But this seems to follow in the same line of their replacements where they focus on celebration as the only emotion in a 3 minute ride, making it feel one-note and out of step with the emotions the ride's thrill elements naturally inspire.
Disney also chose to make the mountain look less iconic. The pyramid like built to a focal point of the tree was dynamic. I wasn't a huge fan of the Boat/Tree on top, but I was open to it. But now....it just looks squat and like any other log flume.
Then there's Disney's big push on the attraction backstory. I love hidden backstories to discover, but Disney has decided to make this front and center. And such a confusing an unexciting backstory. Tiana always wanted to open her own restaurant, but now she is a part-owner of a food supply chain that operates out of a derelict salt mine. That's like Captain Ahab running a frozen fish-stick company out of an old church. It feels clunky and like it is forced to justify the ride featuring human Tiana in a mountain with no danger in the story.
I loved Splash and have a bias to be sure, but also Disney has done nothing to get me excited for this replacement. If it was the book report overlay that went viral years back, I would have felt it was lazy, but I would also be excited for how they would accomplish the scenes and sequences. I would look forward to what fun/spooky events they'd find with Facilier and the shadows. But as of now, Disney's hasn't given me anything to fuel anticipation. We have a kid playing a drum set, Tiana doing a George Washington impression, and a critter band all bunched together. Oh, and Mama Odie joyfully singing to us as we go over a waterfall and fall 5 stories.
The dismissal of this overlay isn't purely out of spite because people love Splash it because people are "anti-woke," it's also because of Disney's track record and what they themselves have decided to share.
And can we all agree that the name is terrible? I was hoping TBA was a cute way of saying the name would be announced later. But nope. Mardis Gras Mountain shall never be.