Jorge, You have identified a very important issue for .LRN. Instititutions do need a systematic way of expiring items such as user accounts and classes. One of the weaknesses currently also of .LRN is that we have not developed a roadmap for integration with external systems. Student information and, therefore, student accounts would typically come from an external system such as a registrar system. Let me flag your question as something that requires more thinking and needs to be part of our roadmap very soon for .LRN.
