If Kronwall is retiring I think it leaves us scrambling to try to find a new number one defender. We never found a replacement for Lidstrom. Of course, you can't really replace a guy like Lidstrom, but the truth is we don't have a replacement in place for Kronwall either.
As old as he is, he was still better than a number of younger guys on the roster this season. I'd take another year of him over another from Witkowski or Ericsson, and I don't feel like McIlrath or Chelios are suitable replacements. McIlrath just isn't NHL caliber except for his ability to fight. Chelios didn't impress me a lot yet either.