Who knows? Maybe it kills whatever momentum they had and Pittsburgh wins in a rout. Maybe Seattle gets a long scoring drive and turns the game's momentum in their favor, while wearing out the Pittsburgh "D".
The important thing is that it happened (or more to the point, didn't happen), and the result is the result.
Notice how none of the seahaw fans here are disputing the botched clip call on Roethlisberger... only focus on the questionable calls against their team.
Botched calls on both teams - not just the hawks. Get over it - Pittsburgh routed them in the second half - and an interception with a missed clip made it close...
Pittsburgh won - get on with your lives folks...