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Had already indicated that we were handling this situation as in the next release as a defect. But will go ahead an accept the new RFE. In the next release, after removing a storage system, should the user click to remove the storage system, despite the warning message indicating that it will affect the relationships, the remove of the copy sets will act more like a remove copy set with the keep on hw option than a straight removal. Note, this means that the pairs will be removed from any GM and cg formation, but it will prevent a full copy should it occur.
I do disagree with the following statement though "Leaving relationships intact on the Storage Device when removing the storage device from CSM would prevent such exposures and be more aligned with the purpose of data replication and snapshots." CSM does already provide several ways, warning prompts etc, to prevent such an exposure. But we will make the remove keep the base relationships on the hw as this would be safer, though a customer that no longer intends to manage the pairs with CSM would need to manually clean them up if they no longer needed the relationships.