Dior is a very interesting case, especially since it could be argued that Luthien was already mortal when she and Beren actually married. But it's plain that the Valar hadn't really thought things through when Earendil turned up! (Unfortunately Dior was only 36 when he was killed, so we have no idea whether he had the "youth of the Eldar" or not).
According to Manwe in QS (1937):
Quote:
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Now all those who have the blood of mortal Men, in whatever part, great or small, are mortal, unless other doom be granted to them; but in this matter the power of doom is given to me. This is my decree: to Earendil and to Elwing and to their sons shall be given leave each to choose freely under which kindred they shall be judged.
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This would imply that Dior and his sons were accounted Men. But would the folk of Doriath have accepted such a short-lived king, even if he was Luthien's son?
I do find it interesting that the choice was explicitly given to Earendil's sons, Elrond and Elros, and that that choice was extended to Elrond's children- but
not to Elros'!