I'd be shocked if they didn't excel in a new environment - Dubois, Scheifele for certain.My personal take is it is wrong to call these guys losers as many have won before in different situations. I think they are an unhappy bunch that has become dysfunctional. In a different situation I think many of them go onto to excel.
Connor is a conundrum this past half season - strange case of the 'yips'. But otherwise as a goal scorer, not in the playoffs, he has excelled.
Hellebuyck with a managed load and more effective defensive structure (say like a center that isn't afraid to skate near his own net) would probably be even better.
Wheeler is what Wheeler is, I don't think his play will improve with a move, but he'll lay his heart on the line all the time. His in-game effort isn't an issue.