Sorry, Gwaihir, but Arwen wasn't an elf, she was a half-elf and, being a descendant of Elrond, she had to choose her fate.
Elrond wasn't an elf, either. He chose the fate of the Elves, but he remained as a half-elf.
Arwen's situation is completely different to Lúthien's or Tuor's. Arwen had to choose, and she knew it.
Lúthien and Tuor couldn't choose. It was after their marriages that Eru changed their fates, but this is something that is not to be repeated very often, as Finrod says in the Atrabeth.
In my opinion, any other mortal/elf marriage woudn't have any effect on the fates of the husband and wife, they would remain as they were before marrying, and their children would be fully mortal.
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But it is said that not until that hour had such cold thoughts ruled Finrod; for indeed she whom he had loved was Amarië of the Vanyar, and she went not with him into exile.
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