The contract extension is why I think it's close to zero. However, at the end of the season if I'm Pegula I'm talking to the core players/leaders on the team (Allen, Diggs, Milano, Dawkins, Oliver) and see what they think of McDermott. If he gets the impression McD's message has gone stale then it's time to cut bait. If they're still willing to go to war for him then give it another season. The easiest transition would be to promote Joe Brady to head coach, keep Beane as GM, and promote a DC from within.
They're 6-6. Unless they buy Super Bowl tickets they're not on the verge of going there.