I actually think attrition is a good thing and despite rumors no school anywhere would impose a mandatory kick out rate. I have heard rumors about a number of schools that are required to kick out 25% of the first class, but that makes no sense why would a school want to kick out paying students? The answer is they don't, but they do have some ethical obligation to dismiss a student they know has no chance of passing the bar.
There are documented cases of schools with GPA curves and academic probation policies that are certain to fail out students each year. A student has expended significant time and money to attend the first year of law school, without mentioning opportunity costs. Those programs should only accept students that have a chance at passing the bar, but they accept more and have mandatory attrition to increase income.
It's a dodge to blame academic attrition on a supposed ethical obligation to discontinue the studies of those who have no chance at passing the bar when the law school should have known before admitting the student that the student had no chance at passing the bar.