I don't think it's the beginning of the end for Hawk despite his rather average performances over the last two seasons, he'll still have a role to play in GB. I would think the personnel in the 3-4 the sub-packages aren't set in stone, and the team will rotate linebackers far more than in the 4-3.
Hawk's not exactly set the world on fire, but he's not been awful either. However, he's not produced what was expected from the 5th overall pick. The draft day video above compares Hawk's potential to Urlacher and Lewis, it's fair to say he's nowhere near achieving that goal.