While Haley is a big name that's still on the market, the move doesn't make much sense.
The Steelers didn't bring back Bruce Arians as OC, and he was often criticized for being too pass-happy.
As Arizona Cardinals OC, Haley's offense had the second most pass attempts in the league in 2007 and 2008. The Steelers have never ranked that high in attempts under Bruce Arians.
While the Kansas City Chiefs ranked 19th in 2009 and 29th in 2010 in pass attempts under Haley in his two full seasons at head coach, one still has to wonder if that was more due to lack of play-makers in the passing game.
Outside of Dwayne Bowe, the Chiefs lacked consistent production from their receivers.
The Chiefs did run the ball in 2010 and ranked first in attempts with Charlie Weis as OC. With Haley acting as his own coordinator in 2009, the Chiefs ranked 16th in rushing attempts—two spots better than Arians' Steelers at 18.
The Steelers passing game is full of threats; Mike Wallace, Antonio Brown, Emmanuel Sanders, Heath Miller and perhaps Hines Ward and Jerricho Cotchery return at reduced rates.
Haley is capable, but as a coordinator, he doesn't have a history of a having a run-oriented attack that Art Rooney II wants the Steelers to regain.
One has to wonder if, ultimately, this would be a good fit for the entire organization.
Update: The Steelers confirmed that they have interviewed Todd Haley for the offensive coordinator position.
Interesting note, Haley would in a way be returning to the Steelers as he was a ball boy in his youth while his father, Dick Haley, was with the team.