The idea of their being a living descandant seems -at least to me- hard to be the case, even if Ariadne survives or another one of creitan princes does it still wouldn't be possible because a major condition for the bovine blood to be preserved is the continous appearance of the bull every generation. Plus the time between the fall of Crete and the present day is so long that even the Gods lost their sanity so it doesn't make sense that a lineage of mixed blood and ichor to survive more that the Gods without the bull appearing.
Plus, when i was reading Lord Dionysus's vote, he called Thesus when talking to Athena by "the hero you so favored", and considering that Thesius left even Ariadne (the one who helped him) to die i was under the impression that Athena really wanted to erase the Creitan lineage of the face of the earth witch makes the idea of a survivor and a descendant a bit hard to belive.