What does "this team is not responding to Karl any more, so he has to go" MEAN, really?
Is it an acknowledgment that the players aren't trying to win playing under Karl, or some other rationalization which doesn't accept the obvious?
How is it not a tacit admission that this team is deliberately not playing up to their abilities (in other words, deliberately trying not to win)?
Why would they magically play better for a new coach, unless they are deliberately playing bad under Karl, presumably because "they've tuned him out"?
There is a chance that Karl's system and philosophy doesn't work with our players. Maybe it is the case they are trying to force a change (eg Cavs and Blatt), but at the same time it is possible that Karl's style doesn't work with the players we've got. So a new coach, with a new approach could help take the team to the next level if he gets the best out of the players. Changes in staff can, and have, had positive effects of teams in the past, and perhaps a change could help us?
As for the case for waiting, maybe they are holding on until they have gathered information on potential successors?
They might want "coach a" as their first choice, or "coach b" as their second choice, but if neither guy wants the job (their reason might be job security or not wanting it until off season), then do they still go through with firing Karl and appointing a temporary coach, or do they hold fire and wait until they can make a change that puts in place a new head coach that they want?
It's a tough decision because Karl does have a good track record of getting teams into the play offs. So maybe there is hope he can still turn it around, but if the locker room has been lost, and the damage is irreparable, then making a change could be needed even if it's just a lame duck interim head coach for the rest of the season...