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 :)
So you are saying that people say gryffindor to fit in rather than being honest with themselves? I wonder what their actual houses would be…what’s your house?
I do meet way more Hufflepuff members now than pretty much any other house these days. Feel like the Gen z fans connect with the fiercely loyal traits and connect with that more nowadays.
I'm between Hufflepuff and Gryffindor. I got Gryffindor on Pottermore, but I didn't feel like that was right, so I took the full version that shows the % for each house, and I waffle between Hufflepuff and Gryffindor throughout the whole quiz, with Ravenclaw right behind, then Slytherin in a distant fourth, lol. I've always felt more like a Hufflepuff, got I like the Gryffindor colors better, so I don't know.