With all due respect, the reason you might have to argue the point is probably because even back in 2007 the application page said:

     The people in your group are what matter most to us. [...] Your idea is important too, but mainly as evidence that you can have good ideas

And Drew was passed up because his idea was bad (not given a "we like you more than your idea" option). It seems like a skating to where the puck is and not where it's going kind of thing.

YC probably won't miss out on a DropBox that looks like a DropBox, but you might miss out on a Drew Houston that eventually creates a DropBox.