My wife and I stopped going to the cinemas a year or so ago because every movie we wanted to see, there was no option within a 45 minute drive to see these movies in anything but 3D.
I'm not sure what it is and maybe it's not the same everywhere else, but on both our Cineplex Odeon and Landmark Cinemas screens at three theatres, the action on a 3D movie is blurry and not at all as enjoyably clear as the normal version. It took weeks for Guardians of the Galaxy to have a non-3D release at our closest (15 away) location and by that point all the excitement was minimized to the point where we figured we'd just wait to watch it at home since it was downgraded to a smaller cinema room with no 3D and lesser quality audio. If we have 60" TV at home and 5.1 audio, why watch the movie at the higher price for a lesser experience when I could buy the blu ray for the cost of 2 tickets?
We also have AVX options from time to time and I actually prefer this and prefer the option to pick a preferential seat but this higher cost option may not be on par with what people want to experience.
So in summary, if you want more people heading to the movies, drop all the gimmicky BS and just give people the movies or at the very least, get rid of 2 x 3D screenings and have 1 x 3D and 1 x normal big screen with good audio.