It becomes a substitute for a socia immediacy that is being denied to people.
I believe that many people don't seem to realize how relevant this is even today. When this was written, I presume that television was the closest one could come to being "social" in the sense of being able to connect with many others at once. With the advent of social media however; this has completely changed and now it seems television is the outdated one that is not immediate enough for our society.