When I hear people talk about DVD sales declining, the only factor I can possibly fathom having anything to do with it is that the DVD market is relatively saturated. By this point in time, virtually EVERY movie has had a DVD release (or two, or three, or four), and people have had the opportunity to pick them up over the years. DVD's also decrease in price relatively quick at the major retailers. Just look at Best Buy's and CC's circulars. Movies that have only been on DVD for 6 months are routinely $11.99 or something. I'm not saying people aren't still buying DVDs, there just isn't as much motivation as there was a few years ago so overall sales are declining, and new releases don't balance it out.