Blues have always been dangerous in the playoffs. But they've always been the bridesmaid and never the bride until everything clicked and they got the talent.
The thing is, strange things don't happen. Talent begets success and 9/10 times, that talent is found at the top of the draft. Carey Price is probably going to be a HHOF Goaltender and is considered to be one of the best in the world at the time. He was a huge reason why Montreal had the success they did. The thing about tanking for Minnesota is to get them lined up to make runs when the cap penalties come off. Shave off cap space to make a couple runs at free agents at the time, make sure your prospects are developing correctly because you don't want a Rossi situation. No one is going, MINNESOTA SHOULD TANK FOR THE SAKE OF TANKING. There is a process.
What you don't want to do is stagnant or end up as a mediocre team that isn't in the playoffs but not bad enough to get a good lottery pick and waste your talent. Pick a lane and work within that confines.
Minnesota essentially wants their cake and eat it too.
That's why teams that are committed to rebuilds show cycles of bad and then good. Look at the Kings, they are finally coming out of their rebuild and are in third place in the West. They took the opportunity to pilfer Minnesota and benefit for their mistake.