I agree, it's a big loss to discourse when a useful word loses its specificity and there's nothing else to take its place. That's why I am one of those who would to fight to keep the "correct" meaning of "disinterested".

I think it's important to distinguish between words like that and other entries in the article's list that are just trite figures of speech, and it won't hurt anyone if they shift meanings or even fall out of use altogether.