I, too, have noticed similar changes in my movie-going habits, for some of the same, but also other, reasons. For my wife & I, it's more about not having the time or being able to find adequate baby-sitting that is really the obstacle, for the most part.
However, I'd augment my response by saying that most of the 'major' Hollywood films released in the past couple of years (I'm being kind here) have, frankly, sucked. Most everything has truly degenerated to sequels, prequels, endless remakes (christ, there's yet *another* Three Musketeers
bowing soon; what does that make, roughly 5, 8 versions of the same damn story???), variations, in short, crashingly few things that are original, or at least seem worthwhile enough to plunk down $22 (!!!).
As a massive film lover, and writer/critic thereof, this situation does sadden me, and, as a result, I too have more or less gone the on-demand route via my Fios options when I want to watch something. It's still a choice, though, and even then the choices seem nil; I know there are numerous films out there I regret missing (and I'm not just talking about the big event films, most of which this year were *hideous*; I loathe the Transformers
series—pretty much detest anything Michael Bay, one of the great hacks of our time, touches anyway—but sorry I missed the X-Men prequel, which is available on-demand now), but, again, time constraints made seeing them about impossible.
All of the above being stated, I have every intention of seeing the upcoming Thing