Congrats to Diane Sawyer she will replace Charlie Gibson on ABC's "World News." Sawyer is the 2nd women in the history of the show to host. Katie Couric was the first. I love Diane Sawyer, I know she'll do good, though it was reported that she was hesitate to take the position. Congrats to Diane Sawyer she will replace Charlie Gibson on ABC's "World News." Sawyer is the 2nd women in the history of the show to host. Katie Couric was the first. I love Diane Sawyer, I know she'll do good, though it was reported that she was hesitate to take the position.