In a piece for the Wall Street Journal, a trio of writers explore the likely upcoming overlap of cable and DVD release windows for movies. They write, and we excerpt:

Historically, movie studios have staggered distribution points -- called "windows" in the industry -- to maximize revenue...Now, declining box-office figures and slower growth in DVD sales, along with the emergence of new technology, have prompted talk of collapsing or eliminating the traditional windows...on balance, studios and cable operators hope that they will make more money if they give consumers quicker access to movies they want, in the form they want them.