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James Cameron spiega la ragione della sua fissa con il 3D alle masse

The characters, the dialogue, the production design, photography and visual effects must all strive to give the illusion that what you're seeing is really happening, no matter how improbable the situation might be if you stopped to think about it -- a time-traveling cyborg out to change history by killing a waitress, for example. When you see a scene in 3-D, that sense of reality is supercharged.
The visual cortex is being cued, at a subliminal but pervasive level, that what is being seen is real. All the films I've done previously could absolutely have benefited from 3-D. So creatively, I see 3-D as a natural extension of my cinematic craft.

e per chi abbia ancora dei dubbi sul fatto che Avatar si propone di essere il film del definitivo sdoganamento del 3D

I plan to shoot a small dramatic film in 3-D, just to prove this point, after "Avatar."
In "Avatar," there are a number of scenes that are straight dramatic scenes, no action, no effects. They play very well, and in fact seem to be enhanced by the stereo viewing experience. So I think this can work for the full length of a dramatic feature. However, filmmakers and studios will have to weigh the added cost of shooting in 3-D against the increased marketing value for that type of film.