User blog comment:Touchinos/Supernatural Season 15: Endgame/@comment-74.132.82.188-20190323002257/@comment-36856379-20190323130555

Well, I think it's because though it was made clear that the show would keep on running as long as Jensen and  jared are free as long as the show keeps getting good ratings, the ratings for season 14 haven't been good enough apparently. That's what I've heard at least.