While his play the last couple seasons has declined with age (from a constant Norris level mind you) I predict Keith will look great again on a competitive team and fresh environment. He’s got it in him to play like a top pairing defender still, for a few months and the playoffs at least, in a situation where he’s not so heavily relied upon. And the next few years he can be eased into a top 4 role ala Chara where he can still play big minutes when needed but has more help and depth on a regular basis.
People are writing his obit way too quickly and you are bonkers if you have a contending team who needs a defensive piece and leadership and don’t think he can be a huge help.
If the Hawks are willing to eat salary (the contract obviously is an issue and I expect the Hawks will swallow a substantial portion of it for the right offer), plenty of teams will be interested in adding a 3-time Cup winning, Norris winning champ to their roster.