Speaking for myself, I can say that Tivo (and devices of that ilk) or DVDs hasn't curbed my desire to go to the movies. I just don't go cuz the costs are ridiculous for the product put out there. Generally, I have to be very bored or very interested in a movie before I decide to attend.
While on the topic of Tivo, a friend of mine was recently thinking about buying one. He was soliciting opinions from everyone he saw, including cashiers and the like. More than one person told him, "I LOVE mine! It's changed my life!" I'm not sure what that says about those people...or my friend, who would probably agree with em now