A quick look at the starting black quarterback coaching situations around the league, not including Green Bay's Hundley (Rodgers injury replacement) and Houston's Watson (injured most of the season).
Panthers - Cam Newton - OC Mike Shula fired. Minority HC safe.
Seahawks - Russell Wilson - OC Darrell Bevell fired. Cuck HC safe.
Buccaneers - Jameis Winston - HC Dirk Koetter very much in the hot seat. Many want him fired.
Titans - Marcus Mariota - HC Mike Mularkey very much in the hot seat, lucky he made the playoffs (and won one).
Colts - Jacoby Brissett - HC Chuck Pagano fired.
Browns - DeShone Kizer - Minority HC safe despite having a 1-31 record.
Cowboys - Dak Prescott - HC Jason Garrett ridiculed a lot, many want him fired.
Bills - Tyrod Taylor - HC Sean McDermott safe for leading the Bills to a lucky playoff appearance.
So one of the eight head coaches fired, 2/8 offensive coordinators fired (head coaches eternally safe), 3/8 head coaches on the hot seat, one head coach safe for making playoffs, and one head coach safe for being a minority. Interesting how all the blame for the overall poor play of these black quarterbacks is being largely planted on the head coaches and offensive coordinators rather than the QBs themselves. These 8 "quarterbacks" in 2017 threw for 148 touchdowns (average of 18.5, good for 22nd in the league), 99 interceptions (average of 12.375, good for 12th in the league - the top three interception throwers in the league were black quarterbacks), 65 fumbles (average of 8.125 each), and 215.15 yards per game (good for 26th in the league). I don't have enough time right now to calculate average passer rating and completion percentage but they would certainly be very low.