I can't believe that there will be more than 25% turnover in coaches this season.
You've got the Jets, Browns, Indy, Denver, Oakland, and maybe KC (not yet, but anything is possible) on the interviewing trail in the AFC.
Detroit, Tampa Bay, Seattle, and St Louis are looking for new bosses in the NFC. And anything is still possible with Dallas.
Forgetting about KC and Dallas, that's 9 changes at the coaching position among 32 teams.