Pragmatically - because the series is about Harry Potter, and without him being the focus (and GryddindorGryffindor being the house of bravery) then it would have made a much less satisfying story, may not have turned into a movie franchise, and encouraged the growth in YA fantasy literature. MightIt may make a good idea for some fan fiction, but questioning character choices for the prime work (particularly if it is successful) is just challenging the story that the author is weaving. But yes - there is now heaps more material for fan fic than would otherwise have been the case ;-)