An excellent suggestion. We have had this on our long term roadmap for a while. We’ll update status again here when we this feature moves into the dev queue and we can provide an ETA.
The time is coming, but we can't yet provide an ETA. An overhaul of campaign interface (and segmentation interface) is planned for 2016. This will include some changes to campaign infrastructure such as requalification.
We are on board with the need for this enhancement and are anxious to bring it to you. We'll be communicating when the time comes that we're close.