In recent years, the media has been awash in exuberant tales of the arrival of the information superhighway, when television will explode with exciting possibilities, offering some 500 channels as well as a marriage of TV and computer that will provide, on command, access to the latest movies, magazines, newspapers, books, sports events, stock exchange figures, your bank account, and much, much more. And the major TV networks, pundits add, will be doomed to extinction by this revolution in cable, computers, and fiber optics. But in Television Today and Tomorrow, Gene Jankowski--former...