Yeah, I don't think they make the playoffs this year, but I do think that they are close to having the right pieces, and that they will improve rapidly when they fill a couple more holes.
They need Dahlin to develop, because while he may be superlative right off the bat, he will have to learn what he can and cannot get away with. And learn how much he can rely on each teammate, and they with him as well.
They need Ristolainen to play within his limitations. I get the sense that he was asked to do too much and tried to do it all. Which lead to being a lot less than he could be. But he's young, I think he'll recover.
And they need an LD who is better than Scandella. He can be on a good second pairing. If he's on your top pairing, I don't think that's quite good enough.
On forward, they need Middlestadt to hit the ground running as much as possible. And they probably need better second line wingers. But I think that for all of the crap they took over the O'Rielly deal, I think they got good depth in Berglund and Sobotka.
People forget the the Sabres BLEW IT UP for a couple of years. So their depth has been the worst in the league, even as they have improved at the top through draft picks and trades. Having competent and effective third liners is going to blow the minds of Sabres fans. And the team will be a lot better this season, I think. But no playoffs until next year and only if they fill in their holes.