Back when Avatar came out, and everybody was lauding 3D as the next big wave, our august body of video editing experts here predicted it would not go anywhere, more than previous 3D efforts had went. Looks like you guys were right. Read story: Fears for future of 3D as films flop
Having said that, it would appear that the porn industry is racing to release 3D: Race is on to make the first 3D porn movie
To quote the producer of the film, Stephen Shiu said: "This is the future of the movie business — it's human nature to want to see things in 3D."
I don't know if I would ever want to see a 'thing' in 3D, especially if it was pointed at the audiance.