Beastly Kingdom, is a dead concept. If they seriously wanted to do that, Pandora probably wouldn't be at DAK.
To be honest, there is no way that I could see them do a clone of IJA for that attraction. It would have to follow a different story altogether, and to use the current infastructure if they are wanting something at DAK by the 50th. And that it would fit in better at Disney Animal Kingdom, to have an Southern American area than freaking dinosaurs.
It would also allow more tourism from that market to come over, especially if Brazil is happening for Epcot; it'd allow Disney to easily market to demographics in South America more than before.
South America for DAK would be a good replacement for Dinoland, as they can still celebrate the natural beauty of the continent, with also bringing something that thematically works.