As somebody who has had a lot of interest in maintaining knowledge bases, yes it does, and the biggest problem is compromising search. It doesn't matter how good your approach to indexing is, there's no better approach to filtering out irrelevant rarely used information other than deleting it. Obscure entries in a knowledge base nobody cares about actually have a negative value.
A secondary negative effect is administrative and technical overhead. As knowledge bases expand and the number of editors stays about the same, the quality of any one entry in the knowledge base will tend to be worse since quite simply people are stretched thinner.
A secondary negative effect is administrative and technical overhead. As knowledge bases expand and the number of editors stays about the same, the quality of any one entry in the knowledge base will tend to be worse since quite simply people are stretched thinner.