Leonardo said:

yes but, Ady, the difference between colour and sound and 3d movies is that while eventually colour and sound catched on, 3d didn't catch on in the 50's, nor in the 70's or 80's. What makes you think it's gonna catch on now, apart from the technology being ready? people are already tired of it.

You answered your own question. If people had to go see Avatar wearing red and blue paper glasses do you think anyone would have given a shit about 3D? You get those things out of cereal boxes.