Lucas states knowingly:
Digital is like the invention of sound, 3D is like the invention of color. Sound changed everything in movies while color made it better.

Idiocy. That's like saying that movies are "better" than books.

3D is just another tool. It depends on the movie and the artistic goal. I seriously doubt that "The Maltese Falcon" would be a better movie in 3D. It wouldn't even be a better movie in color. And would all those Chaplin films really be better with sound? And has anyone succeeded in improving a Lovecraft book by making it into a movie? The closest I've seen was a silent, black and white film (made recently, in the new/improved color/3D era).