I get that similar impression gator. I don't know that it has to do with his work "ethic" though. He has what 3 little girls at home? He saw the demands of a head coaching job and what it does to family life. Yes, ECU wouldn't be in the same stratosphere as Alabama but it's still the head job. And with the head job comes being in charge of coaches, players, staff, administrators, etc... It's just a ton of time no matter the location.
He knows both sides and knows he gets paid well for a lot less investment of himself and his family. I don't see the inner drive to have it all. I see him content just having his small piece.
Most of this is why I would be surprised if he took a job at, or at the level of, East Carolina.
Many people correctly state that cutting your teeth at a school like ECU is a good way to learn the job, but I think most people miss why this is so.
It is true there is less pressure at such a school, but the learning experience comes mostly, in my opinion, from the fact the Head Coach at that level has to be even more hands-on than at Alabama, Florida, LSU, Georgia, etc.
At the top-tier schools, the head man has much greater support personnel and resources to succeed. The head man really can just set a series of events in motion and then depend on the layers of people to carry them out. Not so much at a school like ECU. Thus, the head man has to be even more time committed into even minor details. And that is a truly great opportunity to learn how everything works - so you know how to structure your 'process' and hire people competent to implement same.
Actually, I would think Shula would have a learning curve just as steep at ECU as he had at Alabama. Having never devoted the time or attention at Alabama to immerse himself into the everyday detail of what it takes to build a program, and seeing most of it already in place on the day he first walked into the building, I doubt he would have the first-hand experience of what would be necessary at ECU.
I just do not see Shula spending 16-hour days in the office necessary to learn and grown and succeed. Mostly, as you say, because he just does not have the desire to sacrifice his time away from his wife and girls. And if that is his decision, there is nothing wrong with it. I just do not see him willing to "work hard enough" to be the top man giving what he would have to forgo at home.
He can make a pretty good income for life being nothing more than a QB-coach in the NFL and not have to spend months of the year on the road trying to brown-nose 17-year old egomaniacs to come play for him or appear before Joe Billy Bob Dan fan to speak about the upcoming season and how bad he will be their arch-rival. I do not see the drive in Shula to be a teacher of young players and a builder of young men. He just seems more comfortable instructing someone the techniques and skills of how to be a successful player at one position and go home every night to his girls. Nothing wrong with any of that if that is his goal. Just because his last name is "Shula" does not automatically mean he must be the 5-star General of a team or program or organization just because his father was just such a legend.