So I do have my own reasons, and BTW Boost.Locale is written with backward ABI compatibility in mind.
So once boost "stabilization" would be started as official part of boost I'll be the first who helps.
But why not make a boost trunk clone on gitorious.org and start a boost stable branch yourself? It would probably need some documented update policy (like: sync down from trunk every maybe 2 or 5 years, and in between only ABI-neutral changes are imported and bugs fixed) so users will know they will not be caught in a fork, but have a defined schedule on when to expect new features from mainline boost coming in. But then I could imagine interesting contributors or at least people providing feedback coming along themselves. Best regards, Isidor