I'm legit concerned how they will cast this, considering how the 3 principal kids (Dan Radcliffe, Emma Watson, and Rupert Grint) are iconic and all the adults are some of the world's most famous British actors. It's going to be really, really hard to recast Harry, Hermione, and Ron just for starters. Then they need to recast all the adults too and somehow replace Richard Harris, Alan Rickman, Gary Oldman, Kenneth Branagh, Maggie Smith, Ralph Fiennes, Helena Bonham-Carter, and John Cleese. Plus not only do they need a new Draco Malfoy and Weasley Twins, who were actually in the movies, they somehow need to cast all of the other children who were largely reduced to cameos or entirely cut from the films like Ginny Weasley, Luna Lovegood, Cho Chang, the Patils, Neville Longbottom, Fleur Delacour, Viktor Krum, Cedric Diggory, etc.
I don't envy the casting director for a hypothetical HP TV series. The amount of iconic talent they need to replace, plus the massive amount of additional talent they will need to play book characters who were cut or barely appeared in the films, is somewhat mind boggling to comprehend.
Then there's the fact that we don't really know how much J.K. Rowling will be involved. If Harry becomes black and Hermione is trans then I won't even bother. I don't trust Hollywood to respect the source material in 2023 and it's even worse when you realize that Rowling had a really diverse cast of characters back in 1997 in the books, most of which were cut from the movies, long before wokeness was even invented yet.
And of course the biggest issue will be the fact that these children they cast will be committed to 7 seasons, so possibly a decade or more of their lives, making much more content for a TV show than 8 movies, and these children will constantly be compared to the original actors in every tiny meaningless way day and night. The amount of pressure would break an adult, so imagine the child who plays Harry spending every second of every day of the rest of his life being compared to Dan Radcliffe.