Okay think about this for a moment.
Elros gets married and has kids. We know his dynasty ruled Numenor for over three millennia. Who did they marry? Since it was considered shocking for Ar-Pharazon to wed his first cousin (Tar-Palantir's daughter), I think we can eliminate incest.
We also know Elendil's entire family was descended from one of Elros' descendants. I can't think of any reason not to assume other noble families in Numenor also intermarried with the House of Elros.
Here's some basic math. Even assuming the Kings lived the average of three centuries, having no more than three children each--and lets further assume one third of those never had offspring. Over the course of three millennia that still comes out to thousands of people with Eldar blood in their veins by the time Numenor sank. Not much, I grant you, but in Aragorn's case it was enough to greatly extend his life (by the time of LOTR he's in his nineties if you recall, and still very much in his prime).
As for Hobbits, Tolkien calls them an "ancient people" clearly "related" to Men. Just as clearly, however, they are not Men. Four Hobbits--Bilbo, Frodo, Sam and to some extent Smeagol--resisted the power of the One Ring. Yet nine kings of Men fell utterly under the sway of lesser rings, becoming no more than instruments of Sauron's will (Smeagol, tormented and mad, still remained himself after five centuries). Hobbits live longer than humans, reaching a hundred "as often as not." Also, on a near-instinctual level, they seem more comfortable underground.
The origins of Hobbits are explicitly referred to as "lost" so IMO speculation about same are free game. <i></i>
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