Check out Yahoo! SportsCOMMENTARY | The NFL is big business and all of the teams are in the business of winning. Failure to do so means changes all around the organization and often, the head coach is one of the first to go.Exactly one-fourth of the 32 teams will have new head coaches this upcoming season. All you have to do is tell us which of the eight will be the most successful? Good luck.Bruce Arians (Arizona Cardinals): Last season's disastrous 5-11 finish (following a 4-0 start) sealed the fate of Ken Whisenhunt. Arians was the NFL Coach of the Year with the Colts in 2012, filling in for Chuck Pagano, and helped lead the young team to the playoffs. He's done wonders with quarterbacks in the past, but note that Cardinals' signal-callers have been sacked 162 times since 2010. Ouch...http://sports.yahoo.com/news/starting-over-look-faces-places-nfl-sidelines-174600639--nfl.html