As a White Sox fan I strongly advise against hiring a head coach in their 70s, even if they have a history of winning a championship (or three).
As another Sox fan, I agree with this. But you must remember that the Sox hired a much younger man who has won nothing. So the simple take-away is that neither the Bears or White Sox organizations have a tiny clue about hiring competent people. The Bears and Sox could select someone out of their fan bases to conduct the hiring process and do as well or better than the guys being paid to do this.
Harbaugh is too smug and tainted. Forget about the coaching retreads. Find some fresh guy from a college program and give him a shot. But not a guy who is already Social Security age or a guy clearly swimming upstream without a paddle. Some guy who understands what football means to the City of Chicago and who wants to honor and elevate that. And some guy who can finally figure out how to beat Green Bay at least once in a lifetime.