The Avatar blues are really just...
...another way of expressing one's realized reality of the current world. It isn't really so much about wishing to be transported to this mythical world filled with blue Africans with native American faith systems. It is all about seeing all the geopolitical strife, wasteful attitudes, wanton conflict, and just plain crazy nature of the world, and wishing thigs were simpler and more peaceful.
I am a US Army combat veteran, having deployed repeatedly, and I've got to say I loved the movie. Not because it showed the military in a bad light, but rather the idea that somewhere there are people who can still get along with nature without all this technology and strife. No more killing just to kill. No more not knowing your neighbors because they are too self-involved to get to know anyone else. I long for a simpler life, but right now it is not possible for myself, nor my little family.
I go to the VA, and I get my PTSD meds, I talk to other vets, and I pray that one day I won't feel like sh*t about the world and myself when I wake up. The idea of a real community that actually cares about you, with people working together for the common good, that is what it is all about. Not being 10 ft tall and blue.