Tolkien makes a brief allusion to the future of Middle-earth in a letter written in 1958:
Quote:
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"I imagine the gap [between the Fall of Barad-dur and modern times] to be about 6000 years; that is we are now at the end of the Fifth Age, if the Ages were of about the same length as Second Age and Third Age. But they have, I think, quickened; and I imagine we are actually at the end of the Sixth Age, or in the Seventh."
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As far as Easterlings and Southrons are concerned I would see them as Arabs or Ottomans, especially since we see Gondor having much in common with the Byzantine Empire. And also it makes sense considering Macalaure's good idea with Charles the Great.
I would however see Charles Martel as a more Aragorn type figure, who comes and saves Western Europe from the Arab invasion through his great victory at Tours. Charles the Great would in my opinion rather be Eldarion.
The only problem here is that Charles Martel wasn't a king, so I admit my theory does have some flaws.