Buffalo and Edmonton made crucial mistakes. They added forwards but did not put enough emphasis on defense and goaltending. Thats why they have failed. They have not done everything right. They havent tried to build a cohesive team. They keep adding offensive players (many of whom don't play defense) in the draft. They have neglected that half of the ice. When Edmonton made their run two seasons ago, Talbot had close to a Vezina caliber season. This season he didn't and look what happened.
The Rangers not only are a better free agent destination than eithe rof those places, they have goaltending. Lundqvist can take them until when Shestyorkin/Georgiev/Lindbom can take over. There is a plan there. Right now the defense is bad but Quinn will be able to help modernize it, at least in theory. I don't think their is a magic switch that goes on or off.