Arwen Imladris, I think you are correct in saying that Men is where the hope will come from. Don't forget, Aragorn has Estel (hope), and Men is the kingdom that is growing, everything else is fading. The Kingdom of Men have the strength in numbers, they have the strong leaders (Denethor, Imrahil, Aragorn, Theoden, Eomer...etc), so it is definately in men where the hope lies.
But look at it from this perspective. If we look in the
Lothlorien chapters we get to see all that the elves are losing. They are losing their wonderful home Lothlorien, they are losing the power of the Rings, they are losing their whole way of life, and after this they are leaving. Despite what they are all losing, they still stick with the Men and do their share, that's what you have to admire about them
.