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After 6,000 years I don’t think we can say they will be intermingled at all. These are not Men with a lifetime of 100 years, they are immortal elves. Even Arwen who is accounted young is thousands of years old.

Well, Tolkien did write in his essay "The Laws and Cusoms Among the Eldar" that Elves generally wed soon after they reach physical maturiity (at age 50 to 100). So generations among the Eldar would be approximately 75 years apart (give or take).

I could never quite get my head around the 'elves marry soon after they reach physical maturity'. Taken at face value this would mean that there are prospective spouses within a very short period within the elf's life meaning that even though elves live for thousands of years, it does indicate that within a thousand years an elf may well have ten generations of descendants...
It also doesn't align with the Age of the Two Trees (about 14,000 years) during which Finwe was only a grandfather!
I'm generally of the opinion that this was an oversight on behalf of Tolkien (much like the dwarves naming their greatest home Black Pit on the doorway) and that he should have said that elves wait for the right person though it may take centuries or even Ages before they commit (for example Arwen - any her brothers were even more picky).

I'm generally of the opinion that this was an oversight on behalf of Tolkien (much like the dwarves naming their greatest home Black Pit on the doorway) and that he should have said that elves wait for the right person though it may take centuries or even Ages before they commit (for example Arwen - any her brothers were even more picky).

I know it’s a bit of a digression in this thread, but I thought that Moria (S. “Black Pit” or “Black Chasm”) was a (not positive) name given by the Elves in the Second Age after the Dwarves closed Khazad-Dûm’s West Gates on their noses in the Eregion Wars, when they were trying to flee from Sauron’s rampage on Ost-In-Edhil.

However, perhaps my memory doesn’t serve me well here or Professor Tolkien was not completely coherent in this matter through all his legendarium and texts...

I know it’s a bit of a digression in this thread, but I thought that Moria (S. “Black Pit” or “Black Chasm”) was a (not positive) name given by the Elves in the Second Age after the Dwarves closed Khazad-Dûm’s West Gates on their noses in the Eregion Wars, when they were trying to flee from Sauron’s rampage on Ost-In-Edhil.

Not sure to be honest, though more likely after it was abandoned. The dwarves would not have wanted Black Pit in the same sign as Speak Friend and Enter - sort of undermines the welcoming (no pun intended). If we concede that the Doors of Moria was an oversight then we should accept that Tolkien wasn't infallible and that there are areas that were given less scrutiny than others (what do the tens of thousands of goblins in Moria and Gundabad eat?)