Somebody was talking to me about how IDs similar to "[EMAIL PROTECTED]" are useless because you can't trust the ID when the service provider is gone.
Isn't it the general expectation that these IDs are impermanent? Just like when my email address at work becomes obsolete when I leave the job -- I just stop using that ID. In fact it may be easier to obsolete an ID than an email address. OTOH it might not be, there might be permissions and preferences scattered about the Web, associated with an ID that suddenly becomes useless.
The statement that "permanent IDs are not required" might be useful in the charter. There may also be interesting use cases about how to obsolete an ID.
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