Everyone is the NFL is replaceable.
Everyone.
Even the league's ballyhooed franchise quarterbacks must understand a football player's shelf life is finite. The clock is ticking, and organizations are always searching for replacements.
After all, business comes first in professional athletics.
Some will argue the New England Patriots will never move on from Tom Brady until he's ready to retire. Who are those people trying to kid? Bill Belichick yearns to find a competitive advantage at every avenue. If he feels a revered performer is no longer living up to expectations, the head coach will move on from the player.