This idea is based around the fact that partition location rollover exists for vault store partitions, but not for indexing locations. With the release of Enterprise Vault 10, indexing locations will fill until the location is closed - unlike old indexing locations, which simply stopped adding new index volumes while the data in the existing index volumes could keep growing.
It would simplify manageability if indexing locations could also be rolled over to new locations automatically when a set capacity has been reached. At the very least full indexing locations should have the option of automagically closing before the volume reaches capacity