I mean the best football coach of all time is a nasty old defensive-minded grump who hides his contempt for the media even more poorly than Vic Fangio does.
If teams were smart they would zig where everyone is zagging and take a closer look at Vic Fangio as the guy who can counter all the trendy "young offensive minds" that everyone is so desperate to hire. But the nice thing about the likes of Tampa, Miami, Green Bay, Cleveland, New York, Arizona and Cincinnati is that they are where they are for a reason and none of them are thinking in terms of bucking the trend.
Denver would worry me because they are competently run and could see the opportunity but the Dolphins went and fired Gase, who immediately jumps to the top of their list (and deservedly so).
I also am not sure the Ravens and Harbaugh are sticking together and the Ravens are exactly the type of team that would be all over Fangio. So that's one to keep an eye on.