Eric There have been quite a few underwater IMAX productions, then you have hollywood releases like Sanctum, Shark Night (ok bad example! ) etc. WHOI and Pace/Cameron, among others, would not have underwater divisions dedicated to 3D underwater cinematography if this were a dying format. 3D is here to stay this time I hope, because I've enjoyed the added depth in the picture. I just watched my first 3D martial arts flick. Not the best wushu movie but a decent start!
I hate 3D, went to see Sanctum and Tron in 3D and found it distracting. While not great movies, have watched the again in 2D and enjoyed them more.