I think both QBs have a chance to make decent improvements. Both showed at times that they have talent, they just lack consistency. The best thing to improve consistency is practice and experience. They both saw live bullets and have had spring, summer, and will have fall to practice.
We don't need either QB to explode this year. Moderate improvement should be enough with a solid run game and defense to score more points.
I'm very curious to see if the WR corps improves as a whole or not. Money was hit or miss. DD was mostly miss. He was very good a disappearing for long periods of time. I think Lenz is more consistent than both the Darius' but may not have the spectacular ability that Money had. Gary looked very solid last year and made tough catches. More time in the system should be good for him. West is electric and any improved consistency should help the offense as a whole. Horne shoed flashes especially with run after the catch. The newcomers will be really interesting. If any of them can really get some PT, Bundrage looks like the favorite here, they could shake things up a lot.