Two comments.
A. A TV and renting movies is very different. TV means practically anything is accessible at any time with no effort. Renting a movie requires some effort, and if the person has any busha, they will be embarrassed to take out something which anyone else can see is dirty.
B. That being said, a TV has certain redeeming qualities over the internet (and definitely anything hand held that has unfiltered internet). A TV usually is a main attraction of a main room in a house. Most kids (adults are a different story) will not stretch out on the couch and watch adult programming when anyone can walk in at any time.
*To the poster who saw the yeshiva guys walking into blockbuster, is it possible they were getting something for school? I remember in high school certain films (which had books we were reading in class) were passed around.