It's not even a score every possession thing. It's keep the darn chains moving to keep the D rested thing. That, or score every time. If you can't score every time, which no one can, you'd better at least get first downs to keep your D off the field. No D in the history of football has given up points, or third down conversions, if they weren't on the field.
127th in 3rd downs... That's a bit too much feast or famine to be a healthy team. I know we will always be a quick strike team due to the talent we have, but we also need to convert 3rd downs at a higher rate than we've done the last several years or we will continue to see the same issues, and the same frustrating losses.
I'm telling you now, if we get a QB that can survey the field and deliver catchable balls, and keep drives alive with his feet from time to time, we will see a huge jump in both offensive and defensive production.