I would prefer someone in late 30's or 40's, still working their way up the ladder, rather than a coach who is established and older. I think if you hire the right guy, he will be 3-6 years, and that is what you want.
He would build a program, and take a better job, that is the way it works. Barnes won't be here forever, and Bob Boldon before him made a name for himself, and moved on. Tressel was the exception, staying 15 years and all those championships.
Head coach at YSU is a move up the ladder. I have heard that Ron Strollo wants head coaching experience, but I wouldn't eliminate all assistants. I don't know if Rickey McFadden at Akron is the right fit, but based on experience and being at a winning program, I would think he deserves an interview.