I don't want Duvall into his late 30's. The guy is playing the best he's ever played, and his good years are often followed by years where all he does is strike out. I love what he's done for us this year but signing him for two years after a career year at age 35 seems dangerous to me.
The problem with this year's team was the defense. I think an outfield of Wilyer in left, Ceddane/Duran in center, and Verdugo/Ceddane in right will make for a much better defensive orientation. I'd be fine with trading any of that group to try to get pitching to shore up the rotation, but Duran or Verdugo would probably be my first choice. As others have noted, Verdugo alone wouldn't be enough to get it done, and he's not good enough to net you anything great. But I think if you staple one of Yorke, Mayer, etc. to him, it might get you there (not that I'm thrilled by the idea, but if we can part with one of our prospects who's got a great pedigree but has a risky batting profile, I'd do it). The other option is hanging onto Verdugo another year or trading him at the deadline if Wilyer/Ceddane are knocking on the door for playing time.
I will add that I think people on this board are underrating Wilyer as a prospect - he's got power, he's got patience, and he really came into his own in AAA this year, slashing his K rate while also maintaining his BB rate. i'm hopeful he's going to be murderous in the middle of the lineup next to Casas for years to come, and the Red Sox should have him in their plans.
I'm not worried about any of the position players, not really. I think Urias was a nice grab and will get a chance to hold onto the 2B job - it helps that he's got options and is only headed into his first year of arb. Story probably gets a full season to get right. Obvious place to upgrade would be catcher or center-field, and depending on your orientation, they've already got the players internally to do it.
Looking at bWAR, Urias and Story's previous marks would immediately have made them the most valuable position players with Devers on this Sox team. If Urias can go back to being a 3 win player, if Story can go back to being a 3 to 4 win player, and if they add pitching... I mean, that alone would vault them into a Wild Card spot at the least.