That is a really good point, if you don't constrain the term change you have to include 'damage' as a form of change. Certainly it can be damaging to a company for an individual to leave. I've got personal experience with this and I am sure many people have a similar story in their history.
When I left Sun I got an email from another long time Sun employee who had just quit as well. They said that if I was leaving then the place must be irredeemable and so they were moving on as well. It left me feeling profoundly conflicted because while I had given up on the company by that point I had never intended to cause others to leave.
So I have to accept your point that a company can be changed by the departure of an individual. It may or may not be the change the individual was seeking however.