I think it’s because people are growing out of the reflexive need to be a Gryffindor.

Way back when the series was “just getting big”, everyone wanted to be a Gryffindor because there were just two Houses (Gryffindor and Slytherin) and if you weren’t Gryffindor you were clearly a bad guy.

Watch TV shows from back then – EVERYONE said Gryffindor :)

But now it is 20 years later, and people have realised there are more than two Houses, that Slytherin are not that bad guys and that you can be something other than Gryffindor because people might have heard of it.

Thank you for attending my TED talk. You can find it on tape at your local library :)

Aww why do you say that?

Have you ever taken the pottermore house quiz?