Doc is 62 years old. He seems in fine physical health. A State wrestling Champ, WVU linebacker and a coach of 40 years isn't going to step down if healthy. One cannot just give up that adrenaline rush without a physical reason to do so.
He will have to be asked to leave and if his is, he will find somewhere else to coach either as an assistant or head coach. I'm 61 and have aches and pains but played 36 holes Wednesday, am a weekend warrior around the house an yard, and was a pretty darn competitve single-handed racing sailor until last year when I sold the boat. If I had the weight room facilities, massage therapists, whirlpool tubs and sports medicine institute at my disposal I'd feel 45 as I bet he does.
His success doesn't match Pruett's or Donnan's glory years, but he's done well for us given what MU has to fight. Remember, it took him a while to get his team put together after the Snyder years.