It is really more about matchups and how the Steelers will scheme than it is anything else. To be honest, having Clay Mathews at LOLB is a huge plus for the Steelers. Flozell Adams has done better at RT this season than he did at LT last season.
Now, when you factor in the Packers scheme and the fact that they do not bring the inside backers a bunch, it means that the Steelers can double Raji with Legursky and Foster. Being able to double that nose will help significantly. I would imagine that the Steelers keep Miller in to block Matthews. With Matthews main weapon being speed, that is another plus. Granted, it would be nice to have Heath going out, but if it keeps Ben upright, you have to do what you have to do. Flozell Adams will match up with Pickett. On the other side, I would think they slide Kemo out to Jenkins, which could be an issue, but it is one they have to roll the dice with. Scott would either double that or take Walden if he comes. This would mean that the RB could pick up any DB coming like Shields or give help by chipping. It would put 3 WRs in the routes, which is fine because sooner or later, they wiggle free.
Unless the Packers show some type of interior linebacker pressure, I really do not think the Packers pass rush threat will be significant. While the tackles for the Steelers are not stellar, they are decent enough with help...and the Steelers have been giving them help. The problem the Steelers have had with teams is inside pressure at the guard spots from blitzers. The Packers do not show that tendency.