Going through the divisions:
Oak - Del Rio - maybe due to expectations.
Den - Joseph 1st year guy without a QB, should get another year
LAC - Lynn - 1st year guy, close to playoffs. Will be back
KC - Reid will return
Cin - Lewis is mutually parting ways
Cle - Jackson Should start fresh despite the disfunction
Pit - Tomlin is coming back
Bal - Harbaugh is coming back
Jax - Marrone is coming back
Hou - O'Brien should return. Finally got a QB in Watson, but he got hurt. Lost his pass rushers in Watt and Merciless
Ind - Pagano is gone.
Ten - Munchack I think might be let go if they miss the playoffs. Expectations, plus they need to add more dynamic plays on offence. The bounty they got from the Rams in the Goff deal should have set them up nicely to be the team in the South. Have the QB, 3 1st rounders on the OL. Ground and pound running game.
NE - BB is there until he retires
But - Dermott returns. Total rebuild there
NYJ - Bowles, not much expectations and the fact that they won 5 games so far is impressive. Could go either way.
Mia - Gase returns
Sea - Carroll returns. But, he really needs to turf his OC and OL coach in Bevell and Cable.
AZ - Arians, could start new since they have to break in a new QB. Players love him.
LAR - McVay returns
SF - Shanny returns
NO - Payton returns
ATL - Quinn returns. Should re-consider his OC
Car - Rivera returns
TB - Koetter, could pay the price for a disappointing season
Phi - Pederson returns
NYG - already fired MacAdoo
Was - Gruden could be tied to Cousins. Doubt he wants to re-start with a new QB. I don't personally believe that Cousins is a Super Bowl calibre QB. At least not one without a top level D and strong running game.
Dal - should move on from Garrett
Chi - Fox, likely gone
Det - Caldwell should be gone. Should be in the playoff chase until the last week. Losing to Cincy should seal his fate
Min - Zimmer returns
GB - McCarthy, lots of injuries likely saves his job. But, GB with Rodgers should be a Super Bowl contender year in year out.
To me, the for sure gone are: MacAdoo who is gone already. Fox is gone from Chi. Caldwell from Det. Koetter in TB. Pagano in Indy. Lewis in Cincy is gone. Jackson in Clev should go too. That's 7 jobs I would say for sure.
Maybes are Garrett in Dal due to the owner wanting to keep him. Oakland with Del Rio. Jets if they feel that they need to re-boot. Munchack in Tenn if they miss the playoffs. Arians if they want to re-boot. And a couple others.
Likely to see 9-10 new coaches. I don't think it will be 12-14 that Jay Glazer is speculating.