It will be interesting to see how this all unfolds. The talent upgrade should help immediately, but your team needs time to develop and work together, especially the linemen. You could also see hard feelings if his son struggles much the same as the little league coach who wants his son to bat leadoff and pitch and everyone else sees unfairness.
Yeah I don't think he will be there very long. In the end, when he leaves in a couple years you will see this mass exodus and the program will be a shambles. I do think he stays as long as his son is there but who knows - if he takes another job he probably will just have his son follow and start for him there, too!!