If the culture of the group is chasing away young, high-end talent and has nothing to show for it in terms of success, then I'm not sure we should just shrug our shoulders because everyone does it. Winnipeg has a hard enough time attracting talent without a culture that can't accommodate a cocky teenage goalscoring phenom.
Even if Phil Kessel was chased out of Pittsburgh because of not fitting into the culture, at least they have a culture that's proven to win Stanley Cups (although they won 66% of their Crosby-era Cups with Kessel playing a big role, so I dunno how much that culture was a part of the winning). What have Wheeler, Scheifele and Maurice won? 2 playoff series since 2011. Ironically, it seems that Wheeler was traded out of Boston because he didn't fit into their culture...and then they promptly went on to win a Cup...while Wheeler went on to put up big individual numbers leading mostly terrible hockey teams for the next decade.
The locker room culture being aided and abetted by Paul Maurice and his vet-coddling only makes things worse. Laine saw nothing was ever going to change for him here because TNSE's Loyalty Program guarantees Wheeler runs the room until 2024, and Maurice is the coach until he retires.
But the culture of the group isn't chasing away young, high-end talent. 24 year old Kyle Connor has committed until 2026. 24 year old Nikolaj Ehlers has committed until 2025. Connor Hellebuyck was 25 when he signed a 6 year extension. Josh Morrissey is 25 now and has committed long-term. These players were not their current ages when they re-signed - Connor was 23, Ehlers was 22, Morrissey was 24.
Also check out the ages of the top 6. Wheeler is the oldest at 34, Scheifele is 27, Connor is 24, Ehlers is 24, Stastny is 36 but is likely to be bumped down by a 22 year old C, Copp is 26.
The Jets are in the bottom third, or one of the 10 youngest teams by average age in the NHL. Young players are committing long-term and contributing at high levels. "Vet coddling" comes from playing some experienced guys over rookies, not because young players are being "held back" once they're on the team.
I'm not sure where you got that Wheeler was traded out of Boston because he didn't fit into their culture. Even if that were true, we're now 10 years on so it's moving into the range of not really being relevant.
What did Laine want to change for him here? Play top line minutes? He did last season - people will try to diminish this because "he was only there because Little was hurt" - but he played top line minutes last season, and was demonstrably LESS effective in the offensive zone than CSW has been. He was in his preferred spot on the PP. So the question still is - what did he want to change? The only conclusion I can draw is that Laine wanted to be the unquestionably number 1 player on the Jets and felt that just by scoring goals, he deserved that. It doesn't matter that the analytics show that he is, to quote the Athletic's stats guru Dom Luszczyszyn, "an extreme liability on defence" and "one of the league's worst defensive players". It doesn't matter that he can score goals but do nothing else on his own. No, the idea from Laine is "I have a really good shot and score goals so we should just build the team around me and do whatever it takes to make me happy, who cares about everyone else".
This idea that Wheeler and Scheifele are "pushing out young players" is demonstrably false. We'll see how Dubois fits in but I think he'll get along just fine and I think the team is far better with Dubois than Laine.