A bigger college football playoff faces series of obstacles

Alabama head coach Nick Saban, left, and Clemson head coach Dabo Swinney talk before the Sugar Bowl semifinal playoff game on Jan. 1, 2018, in New Orleans. Swinney and the Tigers play in their third national championship game in four seasons next Monday against top-ranked Alabama. (AP Photo/Gerald Herbert)

When talking about the possibility of expanding the College Football Playoff, the word momentum gets tossed around a lot.