In the 4 years Babers has been a head coach, the lowest number of plays that his teams have run per game is 81.5. The lowest yards per play number that he has had is 5.2.
Marrying those numbers, you get a rough estimate of 423.8 yards per game as the low end of where the offense should be next year.
Taking into account improvement in yards per play, based on natural progression of our skill position players and I could see a scenario where this team easily averages 450-475 yard per game.
All that being said, if we average 400 yards per game I would be ecstatic compared to what we were subjected to the last 15 years. And would put us middle of the pack in the country in the first year of a system that is designed to take two years to fully implement.