This week, veteran CBS News anchor John Dickerson told his colleagues that he would be leaving the network in mid-December, ending a 16-year journey through all its stations of the cross: political director, Sunday show moderator, morning show co-host, and, most recently, co-anchor of Evening News. The decision was officially Dickerson’s, but it was obviously induced by greater forces. When David Ellison took over Paramount back in August, I reported that they would overhaul the struggling nightly broadcast. Meanwhile, Paramount had been gearing up for companywide layoffs, which began hitting the news division on Wednesday. Nearly 100 CBS News employees will be cut, while certain shows and bureaus will be shuttered.