He's definitely done, but I also think he's a pretty smart guy and probably realizes that and will retire after the season.
Different sport, but we've already witnessed the Brian Urlacher soap opera this offseason. Legendary player with rapidly declining skills trying to fleece way more than his value from a team that paid him a lot of money over his career. Ended up sitting next to a phone waiting for all those other supposedly interested teams to call. No call.
I don't want Konerko's career to end the same, but I think he will probably be smart about it, so I'm not worried.