The Wound was capable of causing further destruction to the Force.
First off, you need to understand the Jedi are terrified of anything they aren't familiar with in the Force, and so they shunned it which was a mistake.
That Wound may have put Nihilius on his/her path, and may have eventually lead to the death of the Force had the Exile not stopped Nihilius.
Kreia also objected to you training anyone else, if you recall. She urged you not to take on any new companions. She wanted the Force to die out with you, but in most cases, you do train someone.
Either way, even without Jedi, the Force exists in all living things. If the Wound has a way to threaten the Force in all things, then there is more to the story we don't know.