They may end up bringing the cadet branches back to the fold, but as the article states, would the younger males want to join in the restricted life of the Monarchy?
As the article states, if the public really put pressure on the Govt./politicians, then changes would be made and females would be able to become Empresses. However, then the public goes back to the real issues worrying them in their lives.
Hisahito is going to have a lot pressure put on him and the woman he eventually marries is going to face incredible pressure especially from Fumihito. I can see it. Of course, Hisahito and his wife could have the "miracle male birth" as his parents had. Everyone in Japan knows that Fumihito and Kiko had IVF with gender selection.



https://www.japantimes.co.jp/news/2025/09/06/japan/japan-prince-comes-of-age-succession/