I haven’t read the books since I was a kid, but I don’t know if they’re really compelling enough to justify giving each one its own season. It would be one thing if the movies didn’t exist, but as it stands, it’s a story we’ve already seen before, and it would be a pretty tall order for them overtake the films in the cultural consciousness.
Of course, if they absolutely have to retell the story, it does at least make more sense to do it as a TV show, rather than doing it with another seven or eight films. That would’ve been a complete disaster.