Yes... Of course... But if something like that did happen, the organisations would be able to roll back the data as long as more than half of them agreed. If

Yes... Of course... But if something like that did happen, the organisations would be able to roll back the data as long as more than half of them agreed. If public key cryptography were used, then you could make it so that only change requests signed with the domain owners private key are accepted and distributed too.