ESPN’s Dan Graziano: “If Mike Tomlin becomes available, no coach is safe! “

And they go through offensive coordinators like crazy. That's the problem with defensive head coaches. You lose the good OCs and may have to go through a bunch of bad ones. Finally he has one he'd probably keep in Arthur Smith but I don't think they're winning a super bowl without a franchise QB.
Problem is, look at how long Pittsburgh went without having that franchise Pro-Bowl QB after Bradshaw retired following the 1983 season and the team slogged on the rest of 80's with still-good defenses, decent RB's but forgettable, mediocre QB's like Mark Malone, David Woodley, Neil O'Donnell and even though they enjoyed a resurgence under Bill Cowher in the 1990's, pre-Ben, the best overall QB he had was Kordell Stewart and he was originally drafted as a WR. Even under most of Cowher's tenure, until the very end, they lacked that key, main ingredient to complete the teams' offensive identity. They essentially went 21 years without having that prolific, perennial franchise QB even though they still had extremely talented, deep depth-laden teams loaded with Pro Bowlers.