Disagree on one point. This was not a lost opportunity. Did anyone really see this team going anywhere in the playoff had they made it?
Yes, the coaching on the defensive side of the ball is abysmal and I'm sure there will be major changes in the offseason because of it. But let's not pretend this was the 2001 defense out there talentwise. Perhaps the slowest group of LBs I've seen in the past 40 years. Some guys in the secondary that should not be on a D1 field to begin with (again coaching or the lack thereof has some to do with that).
My point is, the team was quite fortunate to get to 10 wins this year with how much of a liability the defense was. Should they have played some of the younger guys on D? Perhaps, but they probably don't win 10 games this year if they do. Although I will say the additional experience would help next season.