As much as Harbs gets criticized on this board (good amount of it is deserved btw), this is why he's still the HC. His team fights for him just like the Steelers fight for Tomlin.
there's a reason they're now the 2 HCs with the most regular season games against each other in the super bowl era - and are like 3rd on the all-time list i think too (and i think the most played HC matchup took 33 years or something for those coaches to compile all those games)
neither of them are going anywhere until they choose to