I think if I were doing half full and half empty I'd be tempted to put OL and DL into both categories, and for me that's the probable crux of the season.
OL... I love the decision to draft a long term solution to fix this for a good long time but short term, short term two rookies and one inexperienced second year guy is a recipe for some bad days. How many, we don't know but it could be as many bad as good.
If that happens, the offence is a bit screwed. You can't run and run and run if your OL isn't above the line. Wilson and Fields are not the QBs you'd pick for a dodgy OL either.
Alternately, if they come together quickly and do some damage with Smith's scheme, things could go very well very quickly. Harris and Warren behind a good OL with a good OC could really, really punish teams. In a situation where Wilson can rely on his RBs to move the chains and throw at frightened defences, he can cause damage.
Look at the DL and there's a big swing between fit and back to form Heyward, surging Benton, maybe even bounce back Ogunjobi and Leal or Loudermilk taking a step... and having all of those as they finished last season, maybe even a step back or two. Which is the big difference between a DL that is difficult to run on and is collapsing pockets to make the OLBs' life easier, and a DL that is gouged easily and doesn't help the OLBs.
In both cases, I think it's very up in the air and shall have big consequences either way.