At the moment, I'd lean towards us probably taking another tailback in the 2015 class, but that's only a qualified yes, and one that could very easily change. A lot depends on what happens with Bo, and provided that he qualifies academically and remains at tailback, I think it's possible that we don't take another true back in this class.
As for Robinson, he may still end up in Tuscaloosa, but I'm starting to grow a bit skeptical. It seemed a couple of months back like that situation was ripe for commitment, and yet nothing has happened. There are cases going the other way, of course, but typically when you see a delay like that it indicates some underlying issue with either the school or the player (or both) with respect to a possible future together.
Anyway, I'll add my standard objection for the file that people get entirely too worked up over recruiting the tailback position. All of this fretting over tailbacks ought to instead be applied to OTs, CBs, and pass rushers.