Penn State fired their successful coach because he couldn't win big games and had a championship team this season that barley made a bowl game. They let James Franklin go mid-season and he has already found a new job but Penn State has yet to replace him.
All the big jobs are now filled. Even Michigan State made a lighting fast hire after letting Jonathan Smith go. In fact, I saw that Pat Fitzgerald was being hired before I heard Smith was fired. Nobody hired Gruden and Penn State is still open after their AD got hacked on Twitter saying, he doesn't know who the F to hire.