In new interview segment at MTV, Cameron talks about how 3D is still being used improperly in Hollywood:

So there is an evolution, people are now starting to not accept inferior forms [of 3D], which is good. But it's typical of Hollywood getting it wrong, right? We do a film that's natively authored in 3D, shot in 3D, so they assume from the success of that, that they can just turn movies into 3D in 8 weeks� and that's going to work somehow.

But it's just not the way to do it, if you want to make a movie in 3D, make the movie in 3D! And by the way, it should be a filmmaker driven process, not a studio driven process. I've been telling filmmakers for the last five years, [there's] this whole new way to paint, a whole new set of colors, and they've all kind of hung back. Now it's getting crammed down from above, and people are getting told to make movies in 3D, and it should've been the other way around, they should've been banging on the doors of the studio saying, 'I want to make a movie in 3D, let me do it!' And it didn't happen.