If you believe in rumors....
.....Harrison and Starks are done as Steelers. I want changes, but those seem like two of the worst losses we could have, all things considered. If they are willing to dump Harrison, then Polamalu should go as well. It's not like the D was hurting after they learned to play without him - it was still #1 without him playing. And they did it for most of the season.
I would hate to see how bad the O line plays sans Starks. They would be just awful. Ben would get knocked out for the season.