With less than a month remaining in the regular season, all 30 coaches who started back in October are still in their jobs. If that holds, this would be the first time in 53 years that no team has made an in-season change for any reason. “I’m obviously a big fan of all the guys that coach in this league,” said Dallas coach Rick Carlisle, who also serves as president of the National Basketball Coaches Association. “I know them all well. They’ve all earned their positions. And this league should be a stable league.” It rarely is.