That's just it. Not to get all weird on you all you here but reality is created from the inside out. Everything starts with a thought. So if the vast majority of Bears fans think that we're not allowed to have an elite QB because we never have in most of our lifetimes, that manifests into the reality of bust QB after bust QB. Grabbing Fields is either the manifestation of enough people thinking that "yes we can have an elite QB" or the catalyst for it.
Fields might not be an elite QB, that's yet to be determined. But the fact that the fan base is starting to believe, perhaps through this move to get him, cannot be understated. Without hope for a better tomorrow, there's no point in sticking around to see what that tomorrow is.