I can understand why they did that with Red Rackham's, though, as the whole thing is a wild goose chase. A fun wild goose chase, but nevertheless, it involves a lot of sailing and exploring that ultimately leads nowhere and doesn't even turn out to be particularly necessary to the solution of the plot. (Though Haddock vs. the parrots will never stop being funny.)

And I would love if they did the moon books. I don't know that they will, as going to the moon is old hat these days and I imagine it'd be hard to recapture that initial excitement, but they're great books.