I think some heads have to roll on the offense to keep the defense playing well.The offense isn’t going to get fixed in 2021. Coaches and players who are currently unaffiliated with Colorado Football will need to do that. Firing Chev is the first of many dominoes that must fall in order for that improvement to occur.
Even if the offense doesn't actually improve, you've got to let the defense know that you're not just hanging them out to dry.