You don't even know how many games will be required to get to the playoffs. You don't know what the off-season moves are going to be from the Kings or from the competing teams in the western conference. You also don't what's going to happen with injuries. The Kings could get 46 wins next year and still be out of the playoffs.
If "the best coach we've had by a large margin" (Adelman & Malone fans might disagree) doesn't see eye to eye with the GM, you get rid of the "best coach." It doesn't matter whether he's good or not. It's bye bye, it's been great, you've improved our win total, and by the way, you're fired. The relationship between the GM and the coach is essential to the future of your team. If Joerger is good and Walton is good you dump Joerger, pronto, because you as the GM can't work with him because you have different ideas on the team, it's future, how to improve going forward, how to work together, etc. Again, it doesn't matter if Joerger was a good coach if Divac and he couldn't work together in a sympatico relationship. It's irrelevant.