I had been struggling with the same issue. You are bringing a good idea, move them to a Retired Library. However, that would not remove them from the All Applications view. Keep in mind that All Applications intends to show ALL applications that exists, existed or are going to exist in your lT landscape. I would not delete them; I think a better idea is creating an Application Portfolio named "Production Applications." Even when a Portfolio is not merely a grouping tool you can use it that way. I understand that it might bring some overhead by keeping it updated, I think it is a right toll gate to perform a Pre Go-Live review and verify conformance of the Application to be deployed.
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