http://www.theguardian.com/lifeandstyle/lostinshowbiz/2013/nov/14/simon-cowell-x-factor-usa-axed

As The Guardian notes, ratings are now "too atrocious to ignore", having plunged 28% from last year.
Read more at http://www.hitfix.com/tv-tattle#l0JwLig4A3UAALTM.99