Change was necessary. The New York Giants' offense last season was inconsistent at best, and downright infuriating more often than not.
Their running game (29th in the NFL) was bad. Their passing game (17th in the NFL) never seemed to hit a rhythm. The Giants couldn't score points. They finished 26th with just 19.4 points per game, and the six teams below them didn't have a capable franchise quarterback.
With those kinds of struggles, things had to change. So the Giants went and upgraded their personnel, which subsequently will allow them to alter their approach.