New Orleans in a sense has it's own very unique culture, between it's music, celebrations, style, etc. It is distinctly Nola. Showboat Jubilee was a neat concept, but It was out of place in Frontierland/Liberty Square. (Yet, worked perfectly in NOS.)
It is common for Country and "western" to blend, despite them not being the same exact thing. Doesn't mean it's thematically correct. But they can work without detracting too much. It's always kind of shocked me how many people think Splash in WDW takes place in Georgia/the deep south.
But eh, new theme is PATF. Now, to see how the attraction itself will turn out. I personally think DL's should be completed first before they go ahead with Florida's. I think that would be easier for them.