Mike Tomlin and John Harbaugh are currently the two longest-tenured coaches in the NFL, with 19 and 18 hardened and mostly successful years between them. Yet, as the two men and their respective teams, the Steelers and Ravens, head toward a collision course Sunday night in Pittsburgh, the win-or-go-home nature of the affair could extend beyond who gets into the playoffs and who doesn’t. Already, questions about the future of each have percolated amid what has been disillusioning seasons for both clubs. Last week, following a loss to the New England Patriots in which Baltimore blew an 11-point fourth quarter lead and questions were raised about running back Derrick Henry’s lack of usage down...
