It's not even that they NEED a completely different coach and identity to fix the PP.
To me, it's a simple change. You have to put your players in a position that plays to their strengths and allows room for creativity. When I watched this PP, it was set up predictably, with players playing too rigidly within where they were designed to be (often times not in a natural spot for them), killing far too much time off of their odd man opportunity because they weren't being creative enough and ended up waiting for an opportunity instead of making one happen. This in turn leaned heavily on one unit and left the other only about 20 seconds, at best, in which to work.
Again, that shouldn't exactly be on who is involved, top to bottom, on the PP; it's a matter of recognizing that something is amiss and not being willing to make an adjustment.