I think he's too small to be a featured back in the NFL (guys like MJD are the exception to the rule, too -- I don't think he should be used as a counter argument). Just can't see his body holding up.
That said, in a committee of running backs I think he can be a very valuable player. I'm not sure what we will do after Gore leaves. James, Hunter and a big bruising back that can pound it out for a few yards.