Fans always want the problem to be coaching, because they believe coaching is easy to fix. Just bring in some genius and all of the problems will be solved. It's much more difficult to face the reality that your season hinges on your QB, and they are REALLY hard to find.
If it's always about scheme or philosophy it's easy to fix - just make and adjustment, yell more, go for it on fourth down. But if it's about not having guys who are good enough then you are kind of screwed. Right now, at QB we are not good enough. This is life without a top 5 QB. The team plays its collective *** off and loses anyway.
Right now we're at an extreme deficit at the most important position on the field. No scheme will fix that, no adjustment will cure the problem. But the team keeps competing with the guys we can field, and I haven't seen any hint of them giving up in spite of the fact that our QB is on the sidelines and the guys we have to replace him are, relatively speaking, scrubs.