4-8 is a pretty thoughtless prediction.
I'd say 6-6 and 7-5 make more sense. Even accounting for disaster to strike, 5-7 seems more reasonable(Shatner comma)
The O'line and D'line do concern me but not as much as they probably should.
I can't think of anyone on the D'line that was better than what we will field this year. Maybe Big Dan(who played like a big slouch) but I feel that Danny O will surprise some people. He has nice hand quickness and is aggressive. On top of that you can add a more seasoned Vereen and a healthy Maggit to that line and it seems we have instant D End improvement. Once summer arrives we will see the depth either improve or we will know for sure how much our D line will hurt us. I think it's safe to say that at worst it will be a "push" compared to 2013.
As far as the O'line, I think the 2103 line played unmotivated and slow, possibly because they were unsure of the schemes maybe because they were one foot out the door on a disappointing losing and tumultuous stint at Tennessee. Regardless, I concede this current group may be less talented but we have had some core guys in practice for a few seasons and they seem to be hungry and understand the pressure they will face. It could be horrible, it could be pretty good - I see them to be average this first season and hold their own. Not a huge drop off from 2013.
The last spot that concerns me would be the secondary - S and CB to be exact.
We may be starting 2 true freshmen in those spots and that can be scary, although Cam Sutton seemed to do more than hold up his end last year. If those two spots can't produce we will be in some trouble, but if one or both can produce even close to Cam's output, well sunny days are here again.
Every other spot is a clear and in some areas dangerous upgrade(see WR,LB,RB,TE)
Even at the QB position at the very least should be a push.
I don't see us winning the natty title, but 4-8 would be a disgrace and only attributable to an injury plagued disaster of a season.
8-4 if we get some luck on our side, 7-5 or 6-6 more likely.
We'll know more in the summer.