3D has never taken off before because you never used to be able to tell if it worked until the film was printed - by that time you could have wasted a lot of money and time and find that the two cameras were out by a few mm.
These days with digital capture they can get it right pretty much first time round and can sort out any problems before it's to late. This year, and next, is supposed to be when 3D comes of age and becomes popular for good this time.