The problem with most modern management theorists is that they'll see a historical record of 5% of personnel falling below requirements, then they'll set a company mandate of getting rid of 5%. You can figure out what happens when the initial 5% of bad apples are gotten rid of.
Some examples:
Microsfto Stack Ranking
ENRON's Rank & Yank
There are myriad examples. Koch's Market Based Management is another. I can just imagine what this could do at some already demoralized carriers.