The NFL is very unique in that each year, every team sees a great deal of turnover. This is expected given the age of free agency and the fact that there are 11 starters on each side of the ball plus special teams. The New York Giants are no different, and some players who had significant rolls could see their spots taken by younger players.
Or in one particular case, someone who may have high expectations of himself could be limited by an injury he suffered in 2011.
These are not predictions by any means, but it would not be surprising in the slightest to see these players lose playing time to better, younger players.