Well, yeah - indirectly.
Kopitar should have been traded almost a decade ago. The last ten years have seen guaranteed, locked on mediocrity due to over commitments to players whose style of play is built for playoff success on stacked teams and not for leading from the front. Dominant defensive awareness and transitional play is a terrific quality for a winner - but it just isn't enough on a roster that doesn't have top notch offense or dripping with depth. That was readily apparent in 2015 and has proven to be accurate over time.
Its only a knock on Kopitar if you choose to read it that way - he is not the kind of player that puts a team on his back and carries them further than they would have gone without him. He is a specialist that offers virtually everything you would want from a supporting player - plus a very good but not great offensive game. You just can't rightfully expect him to be a dominant #1 center, he is a boat on a tide that rises with a deep roster, not the ocean itself. Unfortunately the organization paid him a massive longterm deal (that his play deserved) that meant that the team wouldn't bottom out far enough to recoup top prospects. Couple that with strip mining of the asset list to get the Cups and chase later unwinnable ones, and you have a recipe for a self-imposed glass ceiling.
If they had dealt Kopitar back then, Anze would be a good bet to have his name engraved on that Cup a few more times. Instead, we have a feel good story and a stat watch that emphasizes remarkable longevity over any period of peak excellence.