I really liked this...it wasn't definite, so that made the ending perfect. I think you have an idea which future most of us our hoping for, but what I liked most about how you wrote this is all the futures seemed perfectly plausible. Even though Harry and Draco did completely different things each time, they were still in character. That was impressive. I also liked the bit of philosophizing at the end, especially this:

Every choice makes a million other choices possible; every choice kills a million choices, too. There might be paths of wonderful and dazzling fortune than people could have accessed if they’d just remained in one location a few seconds longer, or talked with a stranger, or embraced a friend...You can never know what possibilities you murder and which ones you leave breathing in your wild career through life.

That made me think about the choices I make, even the seemingly insignificant ones.