No insider knowledge, but I could definitely see this coming to Broadway (though probably one of the smaller houses). Saw it on the West End and it was a gorgeous production. I don't know if Neil Gaiman would be a huge draw, but he's definitely floating around in the public consciousness with Good Omens (season 2 is dropping in a couple months), Sandman, and American Gods all being popular TV shows. I feel like his main kids book was just Coraline (though I know there are some others), and the rest are geared towards YA at least if not older.