firing the right 10% each year would be great, but that's the problem.
can you expect the management correctly identify the right people to fire, especially when they are themselves heavily over-represented in that class?
can you expect the management correctly identify the right people to fire, especially when they are themselves heavily over-represented in that class?
even for some reason they were forced to, in practice, a cadre of employees (most likely the ones you'd want to fire in the first place), would instantly form some new ad-hoc political layer to exercise political power and control the organization, voting, etc.
so you just end up with a layer of useless management and a independent layer of useless politicians, neither of which are willing to fire themselves.