Change for Change's Sake

Tommy Lawlor, at Iggles Blitz:

A factor that gets largely ignored is that firing Andy Reid is only half the issue. Who do you replace him with? You do not make a change for the sake of making a change. That’s a dumb way to run an organization. Jeff Lurie and Joe Banner need to have some ideas about who might be brought in to replace Reid if they decide to fire him.

Is that true? Take the flipside. Is it smart to keep an employee who isn’t the right person for the job just because you don’t have a candidate to replace him yet? That seems like a poor management philosophy.