User blog comment:Touchinos/Supernatural Season 15: Endgame/@comment-74.132.82.188-20190323002257/@comment-10889355-20190328022943

It is obviously J2M's decision. The CW has been very vocal about wanting to keep Supernatural as long as the actors want to and there are still stories to tell.

Ratings don't matter on a show like Supernatural anymore. It's an established series with a massive fanbase.