If anyone wants a case study on why hiring beloved former players as head coaches in football is a bad idea, check out Jon Embree at Colorado. Played TE at CU under Bill McCartney in the 80's, position coach at CU in the 90's, bounced around the NFL as a position coach in the 00's. Was brought in as the head coach after the debacle of the Dan Hawkins years to re-energize the fanbase. Filled his staff with former CU players and coaches to fill fans with memories of CU's glory years. Fired in two years after compiling a record of 4-21, including 1-11 in his last year, the worst year in CU football history.
Jon Embree wasn't set up for success by the Colorado athletic department. He was asked to come in and clean up a mess left by the former coaching staff, in a school on a geographic island from the rest of the conference, in a sport that hadn't had a lot of success in recent years (sound familiar?). The AD banked on his name recognition to get fans to buy in and his ability to sell recruits on why Colorado would be a good fit. This failed spectacularly. While Embree may have loved his alma mater and been a good NFL player, he was completely overwhelmed by the challenge of rebuilding a football program in a P5 conference.
The thing is, Jon Embree had a WAY better resume to be a head coach in a major conference than Sage Rosenfels does. Embree had been a coach at Colorado for nearly a decade in the 90's, with another decade of experience at other Pac 12 programs and the NFL. Loved the school. But he was in no way prepared to be the head coach at Colorado.
Sage Rosenfels has none of that experience. I agree, I'd love to have him back at ISU as a broadcaster, or QB coach, or something in that capacity. He could even make a fantastic head coach some day. But the odds of him failing as ISU's next HC are overwhelming. ISU has way too many forces working against it (location, tradition, money, etc) to turn the keys over to someone who has literally never run a practice, or recruited, or assembled a staff before.