Finding a coach better than Zim his first few years here? I think that would be a low liklihood. However, Zim is a dinosaur and refuses to adapt to change. He just keeps trying to fit a square peg in a round hole, and thanks to Spielman, doesn't have the horses to overcompensate (like say, Tennessee). I liked Zim for the majority of his tenure here. But honestly, the handling of Daniel Carlson was the canary in the coal mine. It just seemed to get worse and worse after that with how he reacted to situations and how he dealt with them.
You are absolutely right about Hunter; when he went down, I believe I said he alone was worth 2-3 wins this season, because without him, their pass rush is non-existent. But there is absolutely no depth. Yes, most of that is on Spielman. However, there is also a lot of blood on Zim's hands by lobbying Spielman to give big contracts to "his guys" that are past their prime, thereby reducing their ability to sign younger guys and better backups. The giving of big money to Barr and Harrison Smith are especially egregious. Kearse is doing fine in Dallas, and he could have been retained at a fraction of what they're paying Harrison Smith. And you know with Zim's claim of being the "DB whisperer", he has had a lot of input on when/who those are drafted. And their secondary is a mess right now. Green Bay lost their best pass rusher early as well, and have seemed to overcome it just fine.