With all due respect, it's on the coaching staff and front office to sort this stuff out. If despite their best attempts Klay and Wiggins are not able to play on the level that they're expected to, then the onus is on the coach to make the necessary adjustments and even further on the FO for potential trades (which is very unlikely that they do trade Klay for instance but still).
You can't be wasting your once in a generation if not a lifetime player's potentially last years at the peak of his powers. There are 30 teams in NBA and many of them go a decade without staying relevant for rings because they don't have a player of that calibre.
So have all the player meetings you want or need but let's not forget that the responsibility lies elsewhere.
And obviously it's not as bad but bulls had a players meeting after their first season game as well, and now see where they have landed. I hope warriors don't come to that but that all depends on how the following weeks or months are handled by all of the players, coaches and the Front office.
How do they calling every foul for the Kings and Curry is getting grabbed the whole 2nd half off the ball they don't call it a single time?