This Oct. 18, 2012 photo released by E! shows host Chelsea Handler during a broadcast of "Chelsea Lately," in Los Angeles. 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."