In this context, the author advocates a television that is national, general interest, popular: National, because it is from the nation-state that we can best understand their neighbors and get closer to them; general, because the specialty channels threaten to divide each nation based on the interests and social status of their public; popular, because television is not as capable of transmitting elite culture as other media such as books or arts.
Wolton's book to reflect about the social function of television, but it inevitably reflects the issues of his time. This author has published more recent books on the media, and I think this is one of these that I should have read more qu'Éloge the public.