If this were transition for transition sake alone, I would tend to agree with you. Doing so can be disruptive. However, football coaching is an unkind, unemotional, results-oriented business. Coach Lombardi once said that "while winning isn't everything, it is the only thing" when it comes to football. You may find that statement stark, direct, and lacking in compassion, but that is the reality. When you accept this assignment, and the $5 million annual salary, folks rightly expect results. To date, given all the resources provided (monetary, facilities, recruiting, academic support, fan support, etc.), I would give this staff a failing grade in terms of results.
What concerns me most about your argument is your last passage. You are already laying the groundwork, perhaps unknowingly, for a SIXTH Year! If the body of work remains the same, 0.500 or worse, than you should not be 99% behind removal, but 100%.
Performance in individual games in Year 5 matter little to me next to the body of work. Let's not play that game...