Since the can of worms has already been opened, I think the retheme makes absolute sense in DLR. There's a sense of natural transition from New Orleans Square to the Haunted Mansion, a nod to the Garden District in New Orleans, and then out to the Bayou and Mama Odie's. It makes the former Splash a portion of New Orleans Square now. I welcome the change at DLR.
Not really the case for the WDW version which will seem very out of place with Big Thunder Mountain. I wish there was a way to keep both rides, the old in WDW and the new in DLR, similar to the two coasts having different versions of Tower of Terror now.