Well, no matter what you can do at home, nothing will ever change that going to the movies is something to do out and an escape from home. I'm sure that overall, folks are far more selective as to what movies they'll go to theaters to see though. I think at some point, movies will either go straight to DVD, or the pressure will be on movie companies to produce films that "require" a theatrical viewing to enjoy them to their fullest.
TDK is definitely a film to be seen on a big screen. Sure home theater will be HD and fairly big screen, but nothing like the screen size of a theater.