This is a practical matter, and as a matter of practicality, you have to think along those lines. It's fine to be upset with the guy - he's given us plenty to be upset about. But if we're going beyond simply being upset and actually factually wanting a change, you MUST think about who the replacement is.
I'm beyond the "support Bo at all costs" phase and, as noted elsewhere, he has a LOT of ground to make up with the fans. He's burned bridges and turned back to relight the embers. That can earn him a ticket out the door, but rationally, you have to think about what happens next.
Fair enough, but it's foolish to think you can predict with any certainty how a coach is going to do. You hire a person who you think is going to give you good odds of success, who's a good fit, etc. You give them their shot. If they make it, great! If they don't, on to the next one. But the reality is it's just a guessing game.
Look at Pete Carroll. A washed up NFL coach that was the fourth or fifth choice? Turned into one of the best college football coaches of all time. The point is, even the people that do this for a living can't say with any certainty whether a coach is going to "do better" than his predecessor.
All any university
can say is that the current guy is not working and its time to give someone else a shot in hopes he can. Thus, rather than a comparative analysis which would be inherently speculative, the analysis should simply be, "Is the current guy getting it done?" If not, you move on. It really is that simple.