I think this one is going up long term. People don't go to the movies anymore because there is little to differentiate the quality from a home theater. Add in screaming kids, cell phones and missing the show while you go to the bathroom and you can see why home theaters are taking off.
Imax does offer a big differentiation however... This is an experience that I cannot get at home. If movie theaters have a future, it will be by investing in technologies like Imax and digital distribution. I got in a little higher than here, but I have no fear of real losses.