I don't think that I am exaggerating when I say that this one affair ended two careers. In the case of David Petraeus, yes. In the case of Paula Broadwell, more than likely.
Whatever they end up doing in public or private life is now inextricably linked to the fact that this incident resulted in no charges being filed against Broadwell. It's as if the whole thing never should have been publicized in the first place.