you literally state when new coaches come in they bring their whole network. Pair that in with there once again being a finite number of roles due to there being a finite number of schools existing (due to College conferences on top of having the revenue to even havre a legit sports program), why on earth would you propose coaching as if it is some simply avenue. You are having to compete against former athletes who were pros who have more name recognition that you on top of the network aspects (i.e. did you go to the right university and have a noticeable career to even be taken under someones wing for the HOPE that your mentor gets a top job so they can bring you along).
you'd be better of using your 4-5 years to major in something worth a damn and getting a job to make the same money in less time.
The head coach at Tuskegee aint smelling the same salary as the Strength and conditioning coordinator at UAB more than likely. And getting a job as head coach at a Tuskegee is not an easy job at all.