I agree with Sir_Saucy.
Not to be disrespectful to your position on it by any means but I just think in the past you often saw coaches moving to higher tiered schools only. With so much money available in the B1G to the point that a program like IU can almost equally compensate in the same manner as the traditional powers (and in the case of our S&C coach, the NFL) you now see more opportunity for movement. It seems to be how things now happen everywhere unless you are Clemson, Alabama and OSU, but NFL seems to poach those guys.
What I will say is Tom Allen has navigated this unique environment masterfully so far and I am not concerned about anything long term.