This was a special case, won't happen for anyone else. He had two HUGE advantages nobody else will ever have: first, his game was available at a time when the iPhone had very few games (now it has over 1700 games, with a bunch more being released every day), most of the free games were shovelware crap, and there were no game demos. Second, his game was one of the first games ever shown off for the iPhone, and one of the first making really good use of the accelerometer. For some reason, most developers didn't announce their iPhone games until OS 2.0 was already released, so his game got a lot more hype.
To get the same kind of sales nowadays, you'd have to do a LOT of advertising.