212 teams have made mid-season coaching changes in NBA history. Of those, 9 made it to the Conference Finals, 7 made it to the Finals, and 4 won the Championship: Lakers in '80 with Paul Westhead, Lakers in '82 with Pat Riley, Heat in '06 with Pat Riley, and Cavaliers in '16 with Ty Lue.
LeBron needs to average 25.39 ppg over the next 41 games to keep a career scoring average of 27 ppg.