Once Elros had made his mind up to become mortal, his choice was binding upon his descendants. So presumably Elrond's choice should have been binding upon HIS descendants.
However, whilst mortals could never normally aspire to immortality, the Elven-kind could renounce immortality (example : Luthien). So it's logical to assume that Elrond's descendants, being in effect Elves, could renounce immortality or sail to the West.
I think.
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