This coaching cycle has been wild.
For Belichick, it was time to go. He hit his Landry, Shula point where his team just bottomed out. And at 73 with a decade of failed drafts, he is not the guy you want leading the rebuild. If I'm him, I'd just call it a day.
Carroll's firing was a shocker. Sure, missing the WC was a little disappointing, but he had a WC type of team, so missing the playoffs by 1 point is about par for the course.
Same with Vrabel. The Titans weren't good, but their roster wasn't good and they were playing musical chairs at QB. And the team still played hard for him. He did nothing to justify losing his job.
As far as replacements... Vrabel to NE would be a perfect marriage. And as much as it pains me to say it, I think Quinn wants that Seattle job and Seattle wants DQ. He'd be another high-energy defensive guy to just slide right into Carroll's shoes.