Pushing for BK, MI or Aus. is kind of like peeing into the wind. They've all been considered and overwhelmingly rejected by Disney for reasons we'll never know.
MI was a basic concept that never was feasible.
Australia is what I'd personally like. More animals, more mother nature, maybe a cool ride, more cerebral, Disney will never go for it.
I think BK would have been a terrible mess that was based on nothing BUT because Avatar is real, much of that concept or imagination can be utilized. If you think BK had potential I cannot possibly see your aversion to Aatar.