If only Disney ever addressed what happens when you finally accomplish your dream...
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I don't think it's out of the realm of possibility for Tiana's dream to grow once she had her restaurant. In the movie, her father tells her
"You know the thing about good food? It brings folks together from all walks of life." Tiana was raised to view food as a community builder. If she had the means to create one, it is one thousand percent in character for her to go on to establish a co-op.
I don't think this is the most exciting idea for an attraction, and I really hope this whole co-op stays in the background of the ride, with the main focus being on a fun adventure in the Bayou getting ready for Mardi Gras. But anyone who says this food co-op doesn't make sense with Tiana truly hasn't been paying attention.