The verse you brought in, and the King James version, doesn't use the word Nile. But even if it did, human history is not over and things don't look good for the Nile these days.
http://www.greenprophet.com/2010/08/egypt-water-protest/
http://news.mongabay.com/2006/1213-nasa_water.html
___
Also in Isaiah Chapter 19 vs. 2 it says this:
"And I will set the Egyptians against the Egyptians: and they shall fight every one against his brother..."
Sounds like recent CNN reports.
Here's the main problem with your attempt to fit the prophecies of Isaiah concerning Egypt into current events. The prophecies were meant for their time. The prophecies against Egypt continue into Isaiah 20. It begins with Sargon's general taking the city of Ashdod. God tells Isaiah to walk about the land of Israel barefoot and wearing only sackcloth about his loins. This is a sign of what will happen to the Egyptians and Ethiopians. Egypt at the time was ruled by the 25th, or Cushite dynasty, Cush being just south of Egypt and often conflated with Ethiopia. The prophecy in Isaiah 20 specifically states (Is. 20:4):
. . . so shall the king of Assyria lead away the Egyptians captives and the Ethiopians exiles, both the young and the old, naked and barefoot, with buttocks uncovered to the shame of Egypt.
Since the Assyrian Empire came to a violent end in 612, when the Medes and Chaldeans sacked Nineveh, this prophecy can only be for some time preceding that date. In the historical context of Isaiah, the reason the prophet railed against Egypt was that, in order to keep the Assyrians from invading them, the Egyptians fostered rebellions in the Levantine provinces of the Assyrian Empire in the hope that the Assyrians would have their hands full putting down the revolts and be unable to mount an invasion of Egypt. In the process of defending their interests, they used Judah and the over Levantine kingdoms as a cat's paw. Isaiah blamed them for inciting Judah against the Assyrians, resulting in the Assyrians devastating Judah.
Isaiah predicts that the Assyrians will conquer Egypt. Is this a true prophecy? Yes, to some degree: The Assyrians under Esarhaddon conquered the Nile delta. It wasn't until the reign of Asshurbanipul that the Assyrians conquered Upper Egypt, putting Pharaoh Taharka to flight and capturing Taharka's wife. Was divine inspiration necessary to make this prediction? Probably not. The Assyrians were far more powerful than the Egyptians, were expanding and were bound to tire of Egyptian intrigues in the Levant. Thus,the prediction that the Assyrians would conquer Egypt was based on logical probability, not divine inspiration.
It should also be noted that the Egyptian rulers of the city Sais, after ruling Egypt under the Assyrians, stopped paying tribute to the Assyrians, even while Asshurbanipul was still alive, setting themselves up as the new pharaohs of the 26th. or Saite Dynasty.
Historical context is extremely important for understanding the antagonism of the various prophets toward the nations , for whom the prophesied doom. For example, Tyre had, in the eyes of Jeremiah and Ezekiel, led Judah to revolt against the Chaldeans. This, along with the fact that Ezekiel specifically names Nebuchadrezzar as the king who will destroy Tyre, is why it's absurd to try to assert that the taking of Tyre by Alexander the Great was the fulfillment of Ezekiel's prophecy.