Literally is, most teams who tank don't see success for 7 seasons. Like real success, winning a playoff round more than one time.
People were more prone to seeing the early post lockout Penguins/Hawks success as a model to follow. But those teams had assests building while they weren't tanking, they were just in cheap struggling ownership hell. A difference is they had lots of talent rising before they were bottom dwelling. They didn't trade off pieces to be bad, they were more bad while gaining talent/assests for the future.
And the GM at the time of the tank, how many were still around in the end? Neither Edm or Fla GM is still around from back then. Talon was GM til July 2009 before getting demoted. Patrick let go in 2006 after the team drafts their core of MAF, Malkin, Sid, and finished 2006 to draft Staal. ditto TB from their Stamkos and Hedman seasons.
Colorado, Sherman was GM from 2009 to 2014, so under his reign got Landy, Mack in the draft.
So, no payoff to be the GM of a tank job.... That's a reason GMs don't volunteer for a massive rebuild vs try to make what they currently have work. I think it's only Dean Lombardi in LA who endured the bad years and was around for the Cup. GM in April 2006, so he drafted Hickey, DD, Schenn in the top 6. But, made 2 monster deals to get Carter and Richards.
Being realistic, how many of Davidson, Grier, Verbeek will be around should/when Chicago, Anaheim, SJ turn it around?