Again, I believe it is due to economics schools used to have higher standards, but kicking out the floaters results in substantial economic loss.
At almost every law school in America there are probably a few people that should not be there. Dismissing students that do not appear capable of passing the bar are better served to be dismissed after 1L in my opinon as taking 2 more years of their lives and 60-80k of their money is wrong.
Or at risk students should have to be informed of what to expect prior to starting 2L. I believe attrition was higher, because schools were not as tuition hungry, but with the influx of schools there is more of a focus on revenue than education, which is harming legal education and the legal profession.
Bottom line I think law school attrition should go up as it would be fairer to at risk students and improve the legal profession.