Welcome to the Downs, morpheus! A worthy question, indeed! You might want to check out a thread that discusses the finer points of Frodo's need to leave Middle Earth in this thread: Frodo's Sacrifice. It is in the closed and laid to rest threads section, but I thought you might enjoy the views expressed there!
Cheers,
Lyta
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“…she laid herself to rest upon Cerin Amroth; and there is her green grave, until the world is changed, and all the days of her life are utterly forgotten by men that come after, and elanor and niphredil bloom no more east of the Sea.”
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