UNGER: Do you think that the magazine- type shows can adequately replace the full-length documentaries? ... The people who would watch my program on nuclear proliferation are a discreet group in the American society. ... Now, when I look around and I see cable, I read about narrowcasting, I see the revolution thata#39;s taking place in video cassettes ... In an America that is getting increasingly fractional in terms of its groups, how much of a spur that will be for this kind of broadcasting.