In the previous season, Arians had the offense focused on a vertical passing game.
While Luck was successful with this type of offense, you cannot argue with the new offensive coordinator and Luck's success.
Pep Hamilton, the new offensive coordinator for the Colts will be introducing a variation of the West Coast style of offense. This will feature a shorter passing game with emphasize on a power-running game. It is a beautiful, unstoppable style of play if it can be mastered. For it to be successful it will require the Colts to get big, gruff offensive lineman and to devote themselves to the run.
Some will argue that the offense in the previous season was not broken, so, why fix it? My response to this is that the option to not change the offensive scheme is out of the hands of Colts fans. With a new OC, there will be changes.
Hamilton is more than qualified to make them, especially considering the success that Hamilton and Luck had at Stanford with this variation of West Coast offense. Now, the Colts just need to adapt to the scheme and have the right talent available to work it effectively.