Harry Potter was a smash hit about a boy discovering he’s a wizard and going to school in a magical world full of wonder and adventure. Twilight didn’t hit quite that high a note, but the story of a teenage girl who learns her classmate is a vampire and falls in love with him did quite well. The Hunger Games popularized the dystopian genre with a bow wielding teenager stepping up to survive death games, have angsty romances, and fight the power.
As far as I can tell, nothing has quite hit that same kind of high since and it may be awhile until the next truly big wave. But if it were up to you, what would the next big thing be about?
Not just the school aspect.
The idea of a young person who is mistreated in their day to day life escaping to a fanciful world where the normal rules don’t apply and they are accepted and loved by their peers. A world they enjoy and like, that sounds like a place they could belong.
Kids and even Adults want that, they want to put themselves into that character, they want to be that character. Look at the grown adults you see wearing “Still waiting for my letter from Hogwarts” t-shirts.
That is the appeal of Harry Potter. It’s escapism from real or imagined hardships in the reader’s day to day life into a world they WANT to be part of.
My wife suffered horrendous abuse growing up and Harry Potter was one of her few escapes, she wrote to J.K. Rowling to thank her for her means of escaping from the abuse, albeit mentally (although for various well documented reasons she now feels a bit differently about Rowling)