Well, Infinite-Ram may point-out that Linehan, Haslett and Fisher are all available; and there's this accomplished Defensive Coordinator in Kansas City to consider.
They could also focus on getting the Lions' impressive young OC Ben Johnson; and then, hope and pray he turns out to be as good as ... Sean McVay!!!
Personally, I think it is really difficult to get a top Head Coach; and, if you have one, you try to hold on to him.
It's also really difficult to win in the NFL. And, thus far, this is the only season under McVay (his 8th) where the Team ... thus far ... has under-achieved. And that's on the offensive-side where all the cap space is allocated and expectations were high. Finally, the injuries to Kupp and Nacua, plus to the O-Line (zero continuity which is critical to O-Line play, in my opinion) have contributed to the offensive short-comings.