Why was there a guaranteed period of prolonged stagnation?
Is there stagnation if the Kings don't trade the pick that was Barzal for a garbage rental?
Is there stagnation if the Kings draft Nick Suzuki?
Is there stagnation if the Kings draft Trevor Zegras?
is there stagnation if the Kings don't make the Cernak trade?
is there stagnation if the Kings don't hire John Stevens?
You are placing a lot of the blame for the organizations struggles on one-player. Pittsburgh remained competitive because they made a couple of really nice draft picks and didn't make disaster moves like the Kings made.
Dean Lombardi had one of the worst 3 year runs by any GM in NHL history from June 2014 until he was fired in April 2017. If you want to look to why the organization was in the toilet look that way, not at AK and DD.
This was discussed as nauseum here and elsewhere, its not in retrospect or looking in the rear view mirror. These are the clif notes from the arguments made at the end of 2015-16:
A decimated asset list with no picks or prospects to trade to improve the current team.
Next to no cost-controlled production. Toffoli and Pearson, that's it. Both of which were dealt.
Limited cap space to use in free agency, later consistently misused on the likes of Cammalleri and Kovalchuk.
The loss of Stoll, Greene, Williams, Richards, Regehr, Scuderi, Mitchell, and King with the only asset in return being a measely mid round pick for King.
A league record of retirement contracts given out or acquired for Kopitar, Doughty, Carter, Brown and Quick. That influence and power in a "leadership" group resulted in quitting on two coaches and never showing up for a third.
There was no way to improve a team that lost so much and had holes in most areas of the ice. No money to spend, no capital to use in trade, nothing coming from within in to augment a stagnated, satisfied roster. There was nowhere to go but down. And down they went, even after giving Kopitar and Doughty those extensions. It was always inevitable.
The only question was how long do you chase what cannot be caught before the inevitable rebuild. Blake had the perfect opportunity to use the change in management to sell the rebuild, but tried to double-down by bringing in both Pacioretty and Kovalchuk.
Those decisions cost the team a whole lot of years of nothing, and now that they have the pieces from the rebuild available, they are still choosing to place their faith in a bunch of guys in their mid 30s who only ever got out of the first round when they had all those tremendous leaders brought in by Lombardi.
Seriously, Kopitar, Doughty and Quick have only made it out of the first round three times in their entire careers. Three times, never without Sutter, Richards and Mitchell. Not once. So instead of moving on, they buy a series of 2nd line players and tout it as progress.