An NFL.com Article by Dan Hanzus ranks all 32 NFL head coaches on job security. Surprisingly, McDermott is ranked pretty high at 12th. Here's the top 15:
http://www.nfl.com/news/story/0ap3000001041522/article/nfl-head-coach-jobsecurity-rankings-whos-safe-on-hot-seat
1) Bill Belichick, Patriots
2) Sean McVay, Rams
3) Sean Payton, Saints
4) Jon Gruden, Raiders (Mostly because of his insane contract)
5) Doug Pederson, Eagles
6) Andy Reid, Chiefs