Some more notes:
I'd like to move Wheeler for the right offer, but realistically he's staying until his contract runs up. Retaining salary wouldn't be a deal breaker for me but I think he'd be hesitant to move and the team would respect that. He can play on the middle six for now, being bumped to the 3rd line if/when a younger player proves to be better in the top 6.

Adam Lowry would be another player I'd be happy to move, but will realistically stay. He's fine as a 4C and you do need some vets, although I'd like to see Gustafsson eventually replace him. Kassian is also fine on the 4th line for a year or two and can be scratched if need be to make way for a prospect.

Brendan Dillon should be moved at the deadline for a good (a 1st would be ideal, but a 2nd would be good enough if none are offered). He can start out mentoring Broberg or another young dman on the bottom pairing and then be replaced with Heinola when traded. I'd consider moving Morrissey as well if the right offer came along (considering we're already moving half the team, what's one more, right?)
Lines: Connor, Dubois and Ehlers are the new core of this team and based on their results this year it seems wise to keep them together. The second line is less than ideal, with Perfetti being placed with a reclamation project and a declining Blake Wheeler, but I really liked my bottom six and didn't want to mess with it, so I'd just hope they'd be able to fully utilize their offensive talents and catch fire. If Perfetti struggles, him and Svech could be swapped.
My 3rd line of Svech-Barron-Appleton is my favourite of the 4 and besides the top line the one I could see being the most successful in their role. Barron has been solid with us so far, I've liked Svech in the games he's played and Appleton rounds out the line nicely. They're all in their early-mid 20s, which is young enough to make them potential mainstays long term. I really like this idea.
The 4th line is just two veterans and Vesalainen. Lowry unfortunately won't be moved anytime soon, as much as I'd like to see it, and Kassian is good enough to warrant a 4th line role. This is partly to fulfill our "veteran quota" since this is a younger team than we've put out in the past few years. If Vesalainen plays well, he could be moved up into the middle six, although I'd hesitate to break up the 3rd line if they were playing as well as I hope they would. In a perfect world he impresses enough that he bumps Monahan (or Wheeler) out of the top six in the long run. If he flops, Jansen Harkins can take his spot as he's more suited for a bottom six role than Vesa anyways.

Defensively, the top 4 stays the same and Broberg takes Schmidt's spot on the bottom pair. Dillon mentors him until he's moved at the deadline, and then ideally Heinola comes up as the replacement.
In net, Skinner and Comrie split the starts to begin the year and our new head coach is allowed to ride the hot hand. This would likely relegate Berdin to the AHL indefinitely unless one of our goalies flop.

Obviously, this would be a lot of major changes to undergo in a single offseason, and is probably a very extreme route to take (which makes it unlikely to happen since Chevy is our GM). However, I think this team needs some sort of major shakeup as we've been stuck in mediocrity for essentially the past 4 seasons. Becoming the new Minnesota Wild is not a success, and that's where I feel this team is currently heading. Hopefully whatever we do this offseason will at least leave a brighter outlook heading into next year.