These comments are interesting, but it should be remembered that St-Louis and Lacavalier have only been there for a few games and that the Habs head coach still has no guarantee of getting a job next season. It's not easy to assess whether star players will want to leave their organization to join a rebuilding team.
However, this is what happened in New York during the Jeff Gorton era. Artemi Panarin and Adam Fox notably joined the Rangers who were in the midst of rebuild. Since then, they have a team that improves year after year and will knock on the door of the playoffs this year.