Is it beyond their wit to make a children's series about five (or whatever number) children having adventures with their pet?
It doesn't need to be the Famous Five. Just take the core concept and run with it.
Those books were popular because of the formula and adventure, not because of the stereotypes - sex, class, race, you name it.
It's stupid to call it an adaptation - just pay some bloody writers to come up with good new content, and don't hog tie them with 70 odd year old stories that don't need retold (again).