Too pessimistic. We've got four forwards in WBS right now trending towards being NHL players by this time next year, if not sooner. Hayes and Dewar are fine on the 4th line, they're just too high in the lineup. Lizotte is solid. Novak too. So I think you fill one F spot with a WBS forward, another in free agency or trade. Keep the pipeline flowing and push more players out of the lineup when ready.
On D, definitely more work to do, but not awfuk. Letang and Karlsson can still play. Koly and Timmons on the 3rd pair is fine. Pickering looks like a viable #4D next year, so that just leaves gaping hole at top pair LD. Needs to be a defensively responsive guy who can cover for Letang or Karlsson, not a high scorer. Those are easier and cheaper to acquire.
In goal, im not sure how it sorts out but I think we've got the answer in house already. Ned keeps the seat warm till Blom or Murashov is ready to lead. Nothing needed there but time and a little luck in their development.
So again, go get me a top pair D and a top 6 F and we're gonna be way better next season.