There's always been a mƩlange of different states and regions surrounding the Rivers of America, so I don't think it's especially problematic even if the particulars of Louisiana spill out into the exterior. The Haunted Mansion and Sleepy Hollow are New York, the southern part of Liberty Square is Pennsylvania, Tom Sawyer Island is Missouri and (more broadly) the Mississippi River, the Diamond Horseshoe and Jamboree are the far west, Pecos Bill and Big Thunder are the southwest, and Splash is Georgia. I actually think it could be an even nicer transition if Pecos Bill becomes a New Orleans-style eatery since it was always weird to me that it was disconnected from Big Thunder in the first place, plus it might be able to more elegantly flow into the Tortuga Tavern area as a port town that would reasonably have access to the Caribbean.