Kyle Bell could do it, although he will have to stay healthy and do real well this and next season. in which case he would make it as a runningback.
as far as Hester goes... i honestly don't know. i doubt it for some reason, kid's too nice to say that he wants to play runningback and will get pushed to play fullback. possibly get some carries at first and gradually become a blovker only. but that's worst case scenario. he does play for LSU, which definitely helps his case. if he has a couple of good games, like the one last week, he just might pull that one off.
imagine Hester, Hillis, Bell and of course Leonard in NFL in couple of seasons... maybe even Woodhead...