And honestly, using the argument that they don't have conventions or what not is ludicrous in the first place. The great majority of IP's don't hold conventions. I don't hear of many conventions for Song of the South or Twilight Zone, but they make two of the best rides in WDW. I don't know how many times it needs to be said that the IP isn't everything. As long as there are quality attractions - preferably at least one mega E on the level of FJ, TF or Spidey (which Disney has still yet to do) - and true to the movie theming, I don't see why it can't be a great, immersive environment.
Everyone is just getting so stuck on the IP, most saying they should do something Star Wars instead. Guess what? They likely are doing both! Besides, SW would fit worse in DAK than Avatar does.