Since then, the rise of digital media and its infinite screen-time options have cut deeply into the might of the big broadcasters. As the viewing audience fractured, opportunities for must-see prime-time interviews became vanishingly rare. Even the biggest one-on-ones of recent years have lacked the drawing power of the specials from two decades ago and more. The audience of 17.1 million for Ms. Winfrey’s interview of Ms. Markle and Prince Harry matched the number of viewers who tuned in when Caitlyn Jenner revealed that she was transgender to Ms. Sawyer on a 2015 episode of ABC’s “20/20.”The Sunday night special …
