Robert Ramey wrote:

The basic question that occurs to me is "is this library worth maintaining and keeping in boost". If dropping the library would break a lot of users code, then the answer is an easy yes. If dropping the library would result in breaking no code - the answer is an easy no. Otherwise it's a judgement call we can argue about. But in order to do this we need to know the answer the question: "How much code would be broken if not in Boost. Hopefully this sheds light on this.

There's probably a way to answer the question "how many Debian (Ubuntu, Fedora...) packages would be broken if we remove library X from Boost", but I don't know what it is.