I'm not exactly sure if this is what you are looking for, but I'll give it a shot...First though:
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Now, while in the movies there is absolutely no mention what so ever of elves in Helms Deep (besides Legolas of course) on the battle of the fields of Pelenor we know that Elrond's sons are present.(emphasis mine)
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I think you mean books.
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Have the elves really given up on humanity? If I'm not mistaken, the elves at Mirkwood were fighting a powerful enemy at the time, the elves of Lorien and Rivendel had to work hard to protect their domains.... and yet it is possible that they sent two armies to the rescue of Gondor (Namely, with Elladan and Elrohir).
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I don't think they've given up on Middle-earth. They seem to play more of a defensive position in Middle-earth. Their realms are being attacked, and so they can't send out armies of Elves to go fight alongside men. Also, as Tolkien wanted to show this was the time of men, the time when they would rise and soon begin to "take control" of Middle-earth. The ancient races are fading/going away, and the Elves are leaving Middle-earth to Men. However, I don't think the Elves are the type to just give up on Men. If they wanted to they could have said "Screw you guys we're going home and leaving you here. Au Revoir." But, they didn't, they stayed and they fought. And though they played a much less limitted role as they did in the events of the Second Age, we have to consider there's also much less Elves from that time, and also they are being attacked as you mentioned. So, they can't just go out in forces as they did in the Second Age.
This is becoming the Age of Men, and so they have to do the grunt work of the fighting. Though the help of Legolas, Elladan, and Elrohir, kind of backs up that, though this is Men's time to run Middle-earth, they aren't alone.
As for the other part. We are given the numbers of the Dunedain, along with Elladan and Elrohir, so I just don't see how it can be assumed there were more than that.