You will not believe how many bad employees a large organization can carry and still grow and prosper.

I mean, ever talked to an AT&T call center? Do you see them going out of business any time soon?

There was this guy I worked with on a previous job. He was simply unqualified to do his job, and displayed no interest in becoming more qualified. He did the bare minimum to survive, and very often others had to do his work for him so they can make progress in their own job. For various reasons his managers preferred to keep him even though he knew of his low performance. He was there for 3 years when I left. The organization is in no danger of dying, even though around 30% of the employees were of similar quality.