Maybe the battle was keeping the bears (and maybe even the Tiki room given that Moana concept art), and the rivers were the sacrifice. Or there's another battle we don't know about and the rivers were a pre-emptive sacrifice.
Though outside of the Country Bears (which are safe now) and the Tiki Room, I can't think of any other classic attractions that aren't safe. Maybe Hall of Presidents, but the current situation in DC has essentially guaranteed that the HoP will be safe because Disney doesn't want to be a bigger target than it already is. Jungle Cruise just got a big refurb and it's popular enough. Pirates and Mansion are the big two so they're safe. Really at this point, Tiki Room is the only one that's "in danger", and even then, with the Moana replacement cancelled, I can't see anything going in its place except maybe a CBMJ-style new setlist with songs from Lilo & Stitch and Moana?