I have a terrible fear that the Kings are going to suffer the same problem that Edmonton dealt with. Their current roster has a high number of old players that can't be moved and just aren't NHL players anymore.
At the same time the few talented youngsters are having their developed wrecked because you can't put them in a spot to succeed and they have to carry the dead weight of the veterans around.
Fast forward 5 years and it's the same problem just the names have changed. Walker, Lizotte, Prokhorkin, Kempe, Wagner, Amadio are the new Doughty, Kopitar, Carter, Lewis, etc. Now it's up to the next generation of Turcotte, JAD, Vilardi, etc to help them win but no one knows how because ever since they became pros they've sucked. It just keeps going on and on until a true culture change happens.
Okay here's the problem with your statement. It seems like you're treating each 'wave' of new players equally in terms of expectations when they're VERY different, especially in terms of skill and ability.
The Kopitar/Doughty/Brown wave is almost entirely composed of 1st round draft picks. High talent, high skill players. Even Trevor Lewis was a 17th overall pick for crying out loud. Expectations were high for this round of players and given 2 stanley cups, I think we can all agree they did just fine.
Then you have this current round of players: Wagner, Kempe, Amadio, Prokhorkin, etc. Out of those players, only Kempe is a first round pick. He's also clearly the best out of those players in my opinion. The rest are mid-round picks and un-drafted free agents. No one was expecting (nor should they have been) this current wave of players to do much because there's just not a ton of skill and ability there.
Finally you have the next wave: Turcotte, Vilardi, Bjornfot, JAD, etc. This wave of players consists almost entirely of 1st and 2nd round picks (high talent, high skill). Who do we have high expectations for as future Kings?? Turcotte (5th overall pick), Vilardi (11th overall pick), Bjornfot (22nd overall pick), Kaliyev (2nd round pick, but widely considered a massive steal).
This NEXT wave of Kings players is far more comparable to the Kopitar/Doughty wave than the current round of players.
We have to be realistic. This current wave of Kings players aged 22-26 is NOT what Doughty/Kopitar's wave was. It's also NOT what Turcotte/Vilardi/etc are going to be. The Kings changed a lot as a team and franchise when players like Kopitar and Doughty started coming up, all we can do is hope similar changes happen when guys like Turcotte, Vilardi, etc break out with the Kings.