I see both sides of the debate on how much Kopitar should have accepted. I feel like he has no obligation to do it, but some athletes have in the past (Bergeron, Tom Brady) but others certainly have not. Remember he did have Ryan Smyth as a linemate for 2 years, Smyth was very vocal about how he learned to get everything you can from Weight and Guerin, maybe that was passed on to AK and DD. The $7m number wasn't ever going to hurt the Kings, the big risk was in the two years for a guy who will be 37 and 38, but at this point it's looking more and more like Kopitar is going to be more Bergeron and Pavelski than he is going to be Getzlaf. With his game-sense it really is possible that Kopitar could play into his 40's if he wanted to, he is still one step ahead of almost everyone in both zones even as his skating has gotten worse.
As for Clarke, there will eventually be injuries that should open up a spot for him but this is the Kings, they weren't going to give him a spot at 20 without AHL time. I worry about some bad habits being developed in a league where he is just better than everyone he is competing against and also about the potential of being cheap-shotted. But the likelihood of moving Roy or Spence in a deal for a goaltender doesn't seem likely to happen, so next season will probably be his coming out party.