If I work at it, sure, in X years, maybe I can be in the same ballpark as him. But today, if you wanted a game prototype or full game built, Notch would be worth more than 10x me. Just think of the experience he's collected.
If we're talking in the abstract, sure, maybe he isn't 1000x the programmer I am. I'm not really sure there's a huge value in looking at it that way though.