WRT to the OP,
No way Pace or Nagy gets fired if they make the playoffs in this most extraordinary of circumstances surrounding the 2020 NFL season. I think they may have actually learned their lesson from when they fired Lovie after 10-6, only to replace with Trestman/Emery and setting the franchise back five years. I dont particularly like Pace or Nagy but I dont think its fair to fire them if they pull off ten+ wins.
If they blow it and fail to make the playoffs after a 5-1 start they're gone. Seriously, the Bears should be a shoo-in with the seven team field. Blowing it would be such a catastrophe that heads would need to roll.