I felt that we had a chance to add Lamar Miller, a 24 yo proven running back with low mileage who is the fastest running back ever out of the the University of Miami. I think that this addition would've made our running game elite and we could have done even better than we did in 2014 (barring injury) but we, so far, have chosen to settle for having a good running game.
The average gain for 2014's "great" running game and 2015's "good" running game was the same. So you're saying that more attempts will make our running game great again. How do we get more attempts in 2016? Two ways.
1. More late leads
We had 50 plays with a 4th-quarter lead in 2015, and triple that number in 2014. Our rushing yardage will go up when we are once again leading late in games. Most yards and TD in the NFL come from passing, and Romo passing the ball was mainly how we built our leads. And passing the ball became easier with our commitment to run more often, even in the second half of the 2014 season when defenses stopped giving us the run, so we weren't running as well average-wise. The key was we just kept running.
2. Better results from the passing game after a failed running play
In the second half of 2014, Murray averaged 4.3 ypc on 1st & 10, which is about average. But we kept running on 1st down because we weren't risking anything. When our 1st-down play failed (gained between -2 and 2 yards) Romo had a perfect passer rating of 158.3 on 2nd and 8-12. Dallas led the NFL in conversions by the pass on 2nd and long, and ranked #2 on 3rd and 5+. Perfection is a pretty good insurance policy when the run isn't working. Murray's runs gained 2 yards or less 44% of the time in the second half of 2014.
In 2015, McFadden averaged 4.8 ypc on 1st & 10. His runs gained 2 yards or less 37% of the time. IOW, how
well we ran wasn't the problem. The problem in 2015 was that we couldn't run all the time on 1st & 10 because we had no insurance policy if defenses started to play run on 1st down and put us into 2nd and long. Our passing game ranked 28th converting on 2nd and long, and 24th on 3rd and 5+. That's a long way from perfection.