Interesting that some people mention the 2013 Falcons, who were definitely stacked at those positions...yet finished 4-12. Of course, they had the #27 ranked defense (offense was #14). I also don't recall if injuries or other factors played a role.
I agree with John that one of the exciting things about this season is that we have five most excellent skill players on offense, plus a potential top-5 defense as well. I'm really hoping they can figure out the offensive line issues. I think I'm more worried about that than the QB spot.