At running back in 2013 we have Smith and Gulley as the 1-2 punch. AAM and George Morris backing them up. Rene as the emergency 5th RB. I would bet money that they start Estime out at RB. That leaves six even without McFarlane and Broyld. And if people are worried about 2014 - running back is a position that true freshman can play. Bring in two for that class. Throw in the assumption that McDonald will use multiple tight ends in his offense and loves receivers, and I just don't see the lack of depth at running back a problem at all.
Hell, I even think they could redshirt AAM in 2013 along with moving McFarlane to safety and Broyld to TE. That would still leave four running backs (Smith, Gulley, Morris, Rene).