The Packers have to make a decision on Matthews next offseason as he's set to become a free agent in 2019 though.
He'll probably be gone, even if he does rebound this year how do you value an aging player who has underperformed his last contract? The answer is not very high. Reminds me of Cullen Jenkins who was dominant at times during his final year with the Packers but before that hadn't really been more than a solid player and always seemed to struggle with nagging injuries.