Personally I don't think Pandora and Beastly Kingdom are that similar, outside of the superficial similarities between Banshees and dragons (both of them being large, flying 'reptiles') and the fact that both are fictional places with made-up creatures. But beyond that, very, very different ideas with distinctly different appeals. And I honestly love Pandora. But I'd love to see Beastly Kingdom in the park as well.
Honestly, while I do love the tropical locales found at Disney's Animal Kingdom, I always thought a blind spot it had was that it only has land-dwelling, tropical animals. I think the next logical step for DAK as a park is a land featuring aquatic life or species found in slightly cooler biomes. A land that is a combination between the old concept of Beastly Kingdomme and a land that features European woodland fauna like bears and wolves would be really cool.