Mercen-X does kind of have a point. It is possible that Mickey knows alot of Xehanort from Ansem the Wise, and Mickey telling the story to Sora could be a representation of the ending segement. Perhaps some internal struggle with his Darkness, and him winding up as losing? Far fetched, but at this point, anything is possible. This ending far, far more vague than the other ending in KHI. All it's got is a Keyblade War and a mention about Xehanort's memories. In KHI, at least it still looked like something that could be a KH sequel, not to mention the older looking characters.

It wouldn't be the same, but it would still be in the KH universe. If SquareEnix were to make a game good enough, then it would be worth playing. Different maybe, but worth a chance.