With a new QB, the loss of go-to receiver "Smooth" Adams, and re-tooled OL, you have to figure that Gus will lean heavily on the battled-tested tandem of Dyer and OMac to open up his passing game. (Is that a record for most hyphenated words/phrases in on sentence?)
Last year:
Cam carried for 1473 yards on 264 carries.
Dyer carried for 1093 yards on 182 carries.
OMac carried for 810 yards on 95 carries.
Fannin carried for 395 yards on 61 carries.
As a percentage of rushing yards (leaving aside backups and other qbs), Cam had 39%, Dyer had 29%, OMac had 21% and Fannin had 11%.
A full 50% of our rushing yardage and 54% of our carries have moved on. This production must be replaced elsewhere on the field. How will it be split? Of the 325 departed carries (23 per game over last year's 14 game schedule) , I would assume that Dyer's share will increase from 13 carries per game to 20-25, leaving OMac with an increase from 7 carries to around 12-15, and the remainder spread out to reverses and QB draws (Trotter showed some wheels in the SECCG and Moseley looked adequate in the A-Day game).
With 20-25 carries per game, Dyer could post 120-150 ypg (assuming he can maintain his 6 ypc average). Without Cam occupying defenses, however, I doubt Dyer will manage to average such a gaudy number. If he averages 100+ per game, I think you can expect 8-9 wins.
Rambling and incoherent number crunching wrapup note: I'm bored and wanted to throw some discussion fodder out.