I am speculating here, but maybe it’s wrong to assume that Naoko owns all legal rights of “Sailor Moon.” She owns the broadcasting rights of the 90’s anime and her own manga, and she may be the major shareholder, but TOEI, Kodansha, and Bandai may have their share, too. “Sailor Moon” was ultimately animated by TOEI to sell Bandai toys.
There’s also really nothing stopping her from going to another studio. I feel like I see Sailor Moon fans claim otherwise all of the time using weird logic that because Toei had some suggestions for the manga, it makes them co-creator... It just doesn’t work that way. There are plenty of anime that change studios. In fact, Cutie Honey and Devilman’s first anime adaptations of Go Nagai’s manga were both created by Toei and their most recent anime adaptations were produced by other studios. And those are ICONIC works that I doubt Toei would have just let go if they had the power.
Likes:
Star Angel Haruki