One of the most coveted jobs in television is quickly becoming one of the hardest to keep filled. Taylor Tomlinson is the latest participant in a lengthening parade of comics and talk-show hosts who have decided that a perch in late-night TV is just not for them. Tomlinson announced Wednesday that she would leave the two-season-old “After Midnight” on CBS despite the offer of a third cycle this fall and the backing of Stephen Colbert, who hosts “The Late Show” an hour before her program airs. CBS, meanwhile, won’t cast about for someone new to lead her show’s 12:30 a.m. slot. She joins Trevor Noah and Roy Wood Jr. in a recent exodus of people who had won established positions in wee-hours programming but felt they could do better on
