The rise of Netflix and its streaming-based cohorts has forced HBO to rethink its strategy, Vanity Fair reports. Once the dominant force in premium Cable TV, the home of "The Sopranos" and "Game of Thrones" has been beset by challenges of late. Its new owners AT&T are demanding increased accountability (and profits) while its arch rival Netflix is pouring $8 billion a year into its own content and has usurped it in subscriber numbers. HBO says it will fill its schedule with new, more diverse shows.