Think about the last time you actually bought a DVD or a Blu-Ray. Chances are, those purchases are in decline, if you haven’t already stopped buying them altogether. For example, you can stream movies on Netflix (NFLX), Prime Instant Video, or HBO Go. If you wanted to buy/rent a specific movie, you can download it from Amazon, iTunes, or Google Play.
Buying and owning CDs and most other physical kinds of music (with the exception of records, which have been making a comeback in niche groups) are the also way of the past and streaming is the way of the future. Technology has changed the way we listen to music.