Time for some armchair GM'ing as I have some time.
The story for the future is the same as we always thought.
Goaltending
Despite his struggles and dissapointments, Hellebuyck is still trending as the best Jet goalie ever. He could be something special or he could not be... still at the very least he's a step in the right direction.
Jets need another goalie with him though. Pavelec is not good enough. Hutchinson is looking very much likely to be the same.
Defense
Same thing I've been saying since Hainsey left. Jets have a big hole on the left side. The right side really doesn't need any changes. (FYI: Myers typically hovers between #4-5 in these numbers)
A right side of Byfuglien, Trouba, and Myers/Postma is honestly good enough to be a contender. The only problem for the future is Myers is expensive (not as bad in salary though). Postma is a cheaper solution with relatively similar positive impact but you need to figure out a trade destination for Myers then.
The left side is a mess. If I were a betting man and were to place a bet on their numbers next year, I'd guess Morrissey develops into about a #3 and Enstrom will have the tinniest of bump back up to a #4.5. Neither Chiarot or Stuart are capable NHL regulars though. Place Stuart through waivers and have Chiarot as a capable #7.
The Jets don't need to hit a home run on the left side then. They just need to get someone relatively similar range as Morrissey or Enstrom, but preferably closer to Morrissey's age than Enstrom. This means the Jets could be a bit cheaper in terms of what assets they lose or could even look in free agency as a stop gap.
If they are somewhere between a #3-4.5, the Jets defensive depth looks like this:
#3-#1
#NewGuy-#1.5
#4.5-#5
#6.5
Combination of development, one bonafide 2nd pairing defender or 2nd/3rd pair tweener and the Jets move from ugly depth to play off calibre depth.
Forwards
Depending on the status of Mathieu Perreault, the Jets should be set in their top-six. Ehlers, Scheifele, and Laine should take steps forward next season, especially Laine. Laine's scoring is great but his two-way numbers have a lot of room for improvement, which just makes it how scary he could be in the future.
The Jets bottom six could be better. They have depth and pieces unlike in the past, aside from 2014-15, but are not quite there yet.
The ALM line has been fun but as some have noted here they are more of an elite grinding fourth line than a third line. (As an aside I think really Lowry and Armia should have their results averaged out to being two 3rd liners)
Personally I'd like the Jets to emulate a bit of what Penguins or Capitols do: one scoring bottom six line and one good shot differential grinding line. Between Dano, Petan, Kyle Connor, and Jack Roslovic, I think they have the pieces for the sheltered scoring line. The ALM line continues what it does well, although will lose a bit more ice time with the other line being much better than the previous alternative.
Of course their is the potential loss of any piece(s) traded for the LHD spot and the expansion draft. Those, depending on how ready Connor and Roslovic are, will need to be replaced but I think it should be available through smart work within free agency.