The question is of course if all the "A Players" live and breath the company, voluntarily coming into the office on weekends, doing conference calls at 4AM etc - and you are the kind of person who values their family for instance, and wants a little work life separation, what score do you get? What happens if when offered a year long paternity leave, you actually take them up on it? How hostile will the environment be at the company when you return? Or what happens if you have a medical problem that impacts your job performance? And so on...
But, to answer your question... I once got sucked into a management overhaul at a company that used Netflix-style topgrading as justification for a wave of layoffs. The whole self-deportation aspect of it doesn't work very well - people dragging their feet in a job are often reluctantly there because they need things like medical insurance, have bills to pay and families to feed. Being able to just up and voluntarily quit a job because you're "not a good fit" is a luxury. So everyone who was a "B Player" (aka in a role that wasn't well defined) got put through hell for a month then fired, and then the remaining "A Players" lost morale and took up the voluntary quitting aspect. So basically it backfired into brain-drain and a chronic "A Player" retention problem.