[Eorl of Rohan]

Originally Posted by Ibrîniðilpathânezel

Inevitably, the dynasty of Aragorn and his heirs will fall. It did not survive into historical times. But why not? What happened that so totally obliterated evidence of that Golden Age in the distant past? Wars, pestilence, nature -- all of the above?

The loss of the Sea of Faith, perhaps. Let me quote Matthew Arnold:

"The Sea of Faith
Was once, too, at the full, and round earth's shore
Lay like the folds of a bright girdle furl'd.
But now I only hear
Its melancholy, long, withdrawing roar,
Retreating, to the breath
Of the night-wind, down the vast edges drear
And naked shingles of the world."

We no longer believe in the Firstborn or the sons of Ainu, and as they faded from the hearts of men, they have, perhaps, faded from Middle Earth as well.