Rebuilding through the draft is a myth.
Every time this topic arises, people will list the Chicago Blackhawks and/or Pittsburgh Penguins as evidence that the current drafting system works. Those might be the worst examples possible.
Those two teams benefited from back-to-back exceptional drafts within a short period of time. That is where the secret to their success lies, not in general drafting prowess. There is no guarantee that a sound plan for adding junior-aged talent to your team will pan out, and a lot of luck is involved in having those selections become NHLers.