It's very easy to predict..
http://www.google.com/trends?q=3d+tv...ate=all&sort=0
http://en.wikipedia.org/wiki/3D_television
Along with the increasing number of 3D displays owners there will me increasing demand for 3D porn.
It's as simple as that. There is not much real 3D paysites right now. Time for acting? The volcano is about to explode but haters will always dispute. :D