clark: slowly but surely, the 1970s are disappearing. the 1980s will be upon us. what a decade it is coming up. slowly but surely, the 1970s are disappearing. the 1980s will be upon us, and what a decade it is coming up. happy new year. >> as you begin the 80s, in the television world, the landscape on any given evening, nine out of 10 people were watching one of three networks. >> more than 30 million people are addicted to it. social critics are mystified by its success. what is it? television primetime prairie