You're talking about a team going forward that has yet to show me where its #1/2 C is coming from (maybe you'll need both if Larkin gets forced out or wants out), still needs another #1D and arguably upgrades down the lineup on both D and offense, has a goaltending future that is speculative at this point, and you're telling me the core is there? Seider, Raymond, throw in Edvinsson, Kasper and whomever else you like, it's still a core missing short term solutions in many key areas.
And as much as I blamed Holland for the end of the dynastic era and how bare the cupboard was, at this point every person on this roster is there because Yzerman put them there, either through extensions, signings, or through the draft, and we're still not anywhere near a spot where I see them as anything other than a low seed team hoping for a miracle run going forward. Even as the youth integrates, you're not necessarily talking about as a rate of replacement immediately on pare with say, losing Kane when he leaves/retires, or Talbot with how he played, etc.