This is the best post I have seen regarding this discussion. 

What? Cam is perhaps done, but not because he wasn’t a franchise quarterback. Mahomes is going through exactly what I predicted which is exactly what always happens to 2nd year guys who ball in their first year. He’s lost a few games and has been low on acrobatic plays, and has even had a few really freaking bad plays. They’re still going to have a winning season just like Favre and Brady when they went 9-7. OMG what about Peyton right well Peyton didn’t ball his first year now did he. 

Let's see what CK can do the rest of the season if he's going to be the back up.  Release or trade JB for more draft picks and pkg it for an elite QB in the draft.

Why would he be offered a HC job, he hasn't done jack!!! Defense has gone south.

Give yourself the best chance to win every game.    IMO, that mind set is more important then any byproduct that may come about by doing something else.