The role of DVDs (Score 2, Insightful)

In 2001, DVD sales amounted to $4.7 billion in the U.S. This is the fast-growing medium in history. Is it possible that consumers have a limit to how much they spend on entertainment? Is it conceivable that the drop in CD sales is somehow related to the huge increase in DVD sales? Nah... that theory makes too much sense to be plausible.