Personal Opinion here.
Quickly on the discussion above. Personally I've ridden Splash Mountain several times and have never seen SOTS. And I'll freely admit to not fully understanding the plot of the ride or realizing Br'er rabbit wanted to be thrown into the patch. A lot of times I found it difficult to hear a lot of what's being said. Whether from guests talking, screaming or water effects etc. I have the same problem sometimes on Pirates. No sarcasm here I was wondering about the plot a little but didn't want to ask or look it up for fear of being called racist. So thank you for some of the explanation above. Again no sarcasm.
However not understanding some of the plot has never taken away my enjoyment of the ride. It's in my personal top 3 attractions at MK. I always ride it because I enjoy the ride. Now again I'm afraid to admit such things
because people may react badly.
In terms of the Retheme. If people like me are even afraid to admit they like the ride for fear of negative reactions from people then something eventually will have to change. Either the ride eventually will need to be Rethemed or a lot of new effort put into explaining why the theme should stay. Something along the lines of not erasing history but learning from it would work, like what they do before some movies.
As for the Retheme itself. I don't personally love the idea of a swamp mountain breaking up Frontierland. But if they go this route at least do it right. Don't skimp on animations like at gaurdians. Also Retheme the area behind it to a mini new Orleans sq. Type situation maybe even some sort of mickey beginet QS or something.