As long as previous builds are still available then I say drop it. There seems to be a worry with Xith that changing the API make break some phantom users - however, since Xith isn't at 1.0.0 yet API changes are kinda expected. As long the migration path from version to version is fully documented seems like the thing to do.
The last thing you want is dregs of old API hanging around when you don't need it.
(But, heh, weren't you complaining about the painful JSR-231 witch ?
okay was my fault. apologies)