Newby was not the problem with our run game. If he had been provided a good O line and favorable play calling, he would've been right up there with our top RB's of the last 15 years.
In my opinion, Newby needed to have the most things go right in order to be successful. Some backs are able to make up for the faults around them based on their athleticism and football skill, and I don't think Newby is/was one of those types of players.
That's partially why I disagree with the notion that he'd be up there with the best backs of the last 15 years if things were different, or that he'd be to the level of Abdullah if he had an extra year of eligibility (as someone posted above.) First, you could say that about a lot of backs, and second, I don't look at Newby and see the same type of skill/athletic ability associated with some of the other recent backs.
I think Tre Bryant is setting himself up to be a special talent, but as others have mentioned, Nebraska has gotten by for far too long on mediocre line play. Conference titles and playoff berths won't be a reality until that changes.