I'm not as concerned about the number of plays called but the effectiveness of those plays.
Yards per Rush:
2016 - 4.20
2015 - 4.72
2014 - 5.32
2013 - 4.80
2012 - 5.36
2011 - 4.62
2010 - 5.47
2009 - 4.02
2008 - 4.54
Yes, there were injuries and lack of a top-flight back.
But there was also a complete lack of creativity in the scheme and play-calling.
When you can only beat the vaunted 2009 offense in recent history, that's a problem.
Throw in the fact that the 2 leading rushers (Newby & Armstrong) aren't returning, and they both had YPC over 4.5 yards, there is cause for concern regarding the run game.
In fact, looking at returning ball carriers, the stats from 2016 are:
Devine Ozigbo 97 carries for 412 yards, 4.2 YPC, 37.5 YPG
Tre Bryant 43 carries for 172 yards, 4.0 YPC, 14.3 YPG
Mikale Wilbon, 15 carries for 89 yards, 5.9 YPC, 8.9 YPG
Pierson-El, 14 carries for 34 yards, 2.4 YPC, 2.6 YPG
Total 169 carries for 707 yards, 4.2 YPC, 54.4 YPG
That's not a lot of returning production.