But the theme and message of the land and both rides is still conservation and symbiosis with animals and nature - which is the overarching theme of the park. The land also aesthetically compliments the rest of the park. I, too, scoffed at the idea of Avatar in DAK when it was announced, but was stunned when seeing it for the first time and realizing they found a way to make it fit.
If they didn't care, they would have made Flight of Passage be about a mech battle or something (which is absolutely 100% the direction Universal would take).
Even if you don't agree on Pandora, remove it from the equation and DAK is still the most cohesive theme park especially now that Dino-Rama is being demolished.