The rapid spread of cable TV was the development that brought about a dramatic reduction in television's capacity to generate interest in the news.
As cable TV became common in the world, people lost interest in the news. This was because there were so many other things that the cables brought which made interest in the news less common.
Using cable, people became more interested in watching entertainment channels that offered serials, dramas, etc.
Cable TV caused people to become less interested in the news and more in the entertainment channels.
Although a part of your question is missing, you might be referring to this question:
What development brought about a dramatic reduction in television's capacity to generate an interest in news?
an increase in newspaper circulation
the rapid spread of cable TV
the rise of Internet news consumption
a drop in education levels in the United States
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