Well, the million dollar question that none of us have insight to is what the rest of the QB room looks like in practice and whether they give you a better chance to win.
Do you think Caldwell, Owens, or Lacey elevates this offense to the point that winning out is possible? I personally don't, and in that sense it could be reasonable to try to have Arch play through the struggles if you see potential there on the other side. Of course, if you're serious about winning games this season, you probably do have to give someone else the ball because it truly almost cannot get worse, but I don't think we are at this point. This isn't a CFP level team, just don't have it on offense. So it seems to me the hope is Arch grows from this and can lead a better unit next season.
Beyond that,we're obviously not benhing Arch anyway just given the politics and narrative of th whole situation. Honestly I think it's likely we ride or die with him until next season, and if he still sucks by this time next year maybe you see Lacey when we're out of contention.