By Berry Tramel Columnist btramel@oklahoman.comCollege Football Playoff expansion talk brewed this week, and an eight-team playoff seems to have more momentum than ever before. But before the celebration ensues, it's best to remember the hurdles that could keep the playoff field at four for quite some time. The Athletic reported this week that Wisconsin athletic director Barry Alvarez, a past member of the playoff committee, said, “Everyone has the same feeling; expansion is inevitable… I think we need to serve more people.Read more on NewsOK.com