If the distribution has been around a while, I'd rename it under the new namespace, and make prominent notices in the original dists POD that you won't be updating this one any further, link to the new one and state to use that, and the existing one will stay in place as to not break applications that are currently using it. (However, if you happen to realize there are severe security or data loss type issues, backporting would be a pretty reasonable/decent (update proper /update) thing to do if you know people are using the deprecated version).