Doug Pederson and the Eagles winning LII really speaks volumes as to how much of an underachiever Mike Tomlin is. Loses his starting QB (who was on an MVP tear) and still wins the Super Bowl. No coach has done less with more than Mike Tomlin.
We lose Ben for any considerable amount of time and the team more than likely falls apart. Great Coaching makes average teams good, and good teams great. Inferior coaching results in an early Divisional Round exit to Blake Bortles.
Sooner or later, the Steelers Organization have to realize that they may have a second Disco Dan Bylsma on their hands. The Steelers are in the exact same situation the Penguins were years ago. The Penguins just could not win despite a very good roster and continually underachieved.