I said "plot hole" not pothole", referring to people who are saying that getting a new coach will fix everything. The plot hole is like what you said about just hoping that you achieve a better outcome. It's a huge call to oust the head coach which can have long reaching ramifications (good or bad). A decision that should be based on more than hope and the whole "Well, the last few years we have gone backwards" thinking. You have now said that after having 5 years of evidence, you are undecided what to do and are a week to week proposition, so the question probably doesn't apply to you but I will ask again next week in case you have changed your mind.
There are usually a few reasons why a club brings in a new coach.
The current coach has lost the desire and wants to hand over the reigns. (Roos, Thompson)
The current coach has lost the support of the playing group. (McCartney, Sanderson)
The club has decided they do not have a side capable of winning a premiership in the next few years and go the rebuild. (Clarkson, Hardwick)
A veteran coach wants to join the fray again and the club believes that they can get a premiership with their experience. (Malthouse, Lyon)
I'm sure there are more but those are the staples and looking at the side at this very moment, I don't think we fit any of those criteria though we may at the end of the season after extensive review. I know it's pretty irrational thinking, but I have always been a bit of a loose cannon.