“Ratings for ‘The Originals’ have also fallen more than 30 percent, but they’re about equal to ‘Reign’s’ performance in the post-‘Vampire Diaries’ spot last year. ‘iZombie’ is running well below what ‘Supernatural’ did on Tuesday last year, but ‘Supernatural’ has improved Wednesdays by just about the same amount compared to ‘The 100’ last fall.”