FILE - In this Oct. 30, 1986 file photo, talk show host Joan Rivers, right, talks with guest, first lady Nancy Reagan, during her appearance on "The Late Show Starring Joan Rivers," on Fox TV. The role of female talk-show hosts in late-night TV network history, all 50-plus years of it, can be summed up in two words: Joan Rivers. It takes just another two _ Arsenio Hall _ to do the same for minorities. There's no indication that's going to change in the latest round of musical chairs involving "Tonight" and "Late Night." (AP Photo, Reed Saxon, File)