I'm of mixed-mind when it comes to Kuznetsov.
On one hand, he's definitely underperforming and is one of the (several) primary culprits regarding their inconsistent and underachieving play this season. He's a prime candidate to having his cap space re-allocated, as a result.
On the other hand, if there's one veteran player who has the potential to rebound dramatically next season, it's Kuznetsov. His up-and-down play has been a hallmark of his career so far, by every standard (boxcars, "eye test," and advanced metrics). He's a guy that will go from 77 points to 59 points to 83 points in three straight healthy seasons. A guy that half the board will demand needs to be traded one season, to him being untouchable the next. It certainly is not out of the question that he could be the team's best forward next season.
Ultimately, this is a team will three centers competing for two top 6 center spots, and too many centers vying for spots as a whole. It's also a team who's most expensive center has serious health questions. It's hard to do a whole lot of planning regarding trading Kuznetsov until we know what's going to happen with Backstrom. Is he truly "pain free?" Is he someone that they are counting on playing all 82 games next season? If he's playing, is he going to be anything like his old self, or is he going to be the guy who has 3 5v5 points in 9 games so far this season?