Firing coaches and AD's sounds like fun. Let's line 'em up and just shoot them. We could get the Donald to do a whole show on this... "You are fired!" However, we really should understand what is missing, and how we got here before we take corrective actions.
My observation is that we have too few kids that have BIG size and speed. We have a few, but if they get dinged, we are super thin, and cannot replace them in kind. I think our QBs are okay, not great, but okay. I think our WR are too slow and not playmakers. The RB (Jones is a BIG player) is thin. Defense has almost no players that I would consider BIG capable. With this talent, nobody is going to be successful as a coach. No offensive play calls will work, no matter what football genius calls the plays.
I think any resurgence of Purdue football must start with better recruiting. Simply replacing the coach or the assistant coaches may not change our recruiting direction. We must understand why we are not recruiting at the level we need. We need to answer the question of whether we are starting to recruit better in the last couple years before we jerk the program around.