This is a very cool discovery, and it opens up all sorts of intriguing possibilities. But it in no way justifies the pronouncements coming from the scholars involved here. For example,
"We believe that this evidence provides conclusive proof that they [the lost colonists] moved westward up the Albemarle Sound to the confluence of the Chowan and Roanoke rivers," said James Horn.No, it does not. John White, who drew the map, never found the missing colonists. Or at least that is what he said, and from what we know of the expedition he had no opportunity to sail up the Roanoke River on his own. He might have drawn the fort on the map as a guess, or in response to a rumor, or because he misunderstood something someone else had told him. White wrote in his account of the expedition that he believed the colonists had gone south, not west, and moved in with the Croatoan Indians. If he knew they had actually gone west, why would he have lied about it? Perhaps to protect them, I suppose, but, again, we don't have any indication that he learned anything that everyone else on the expedition did not also learn.
Archaeologists will, I assume, start exploring the area of the fort symbol for a 16th-century colony. Even if it existed, though, such a brief settlement of fewer than a hundred people without much in the way of supplies might leave few conclusive traces for us to find. The good news is that the area is still largely rural, so at least there is some chance of finding a trace of any fort that was ever actually there.