Since these are ideas written after LOTR was finished, they are considered definitive. I can send you a Word document of the letters if you wish to review them on your own. The comments Tolkien made in the later letters were always in response to questions, so they were not merely his ideas (though it was all his idea - but not in that sense), but how he had decided Middle-earth were be, thus they are conclusive.
If you read some of the letters and the extent that Tolkien goes to in reguards to anything concerning his books, you'd know that this was no 'flaw.' The wraiths were not immortal. The One Ring would not last forever, and so, neither would the wraiths.
[ August 14, 2002: Message edited by: Legalos ]
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...take counsel with thyself, and remember who and what thou art.
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