Will someone call the Steelers bluff?

The Steelers have named three finalists to replace Bill Cowher: Russ Grimm, current Steeler Oline coach and Assistant head coach, whatever that means. Mike Tomlin, defensive coordinator for the Vikings and a Tony Dungy protege. Ron Rivera, defensive coordinator for the Bears.

The longer the Steelers wait the more obvious it becomes that Rivera is their man, since they can't talk to him until the Bears season is over. But if the Bears win Sunday, the Steelers will probably have to make a pick among Tomlin or Grimm. What's to stop Tomlin and/or Grimm from withdrawing their names from consideration, knowing that another opportunity will be coming down the line for them? And the longer the Steelers wait, the better bargaining position Rivera has when contract talks arise. Especially if he's the only candidate left standing.

If Grimm doesn't get the job, he is likely to be fired by the new coach, whoever he is. So he may withdraw his name from consideration if he feels he is being passed over. But perhaps he doesn't want the last coaching job on his resume to be an underperforming Oline one year after a Super Bowl win. Maybe Whisenhunt will take him on in Arizona. Tomlin has nothing to lose either way.
He has job security right now and will be a top candidate in future years, especially with the Rooney Rule in place.

I have to wonder: is the Steelers job that coveted? I like Art Rooney II's no nonsense style, but that may also mean that the days of sticking with a head coach through hell and high water are over, and the Steelers head coaching position may soon become just another job, which automatically causes the position to lose much of its appeal, as the Steelrs are notoriously penny pinching and don't go after name-brand free agents...or is AR II going to change that too?