I don't think there is any director in Japan right now capable of directing Ghibli level movies, by that I mean movies that are pure of heart, but interesting enough that you like them, all or at least the vast vast majority.
It's no secret that 2d animation is very expensive and taxing, and if you make failed movies you risk a studio like Ghibli.
Both Yasuhiro Yoshiura and Mamoru hosoda come to mind as directors that could direct films like that if required, but I don't know how consistent they would be if directing constant movies like it.
Regarding Makoto Shinkai I think his movies are a bit too sadistic, or at least his mentality to be do Ghibli films, directing tragic/NTR movies when he was happily married to an audience of mostly shutins always came to me a bit sadistic, even though his movies are visually beautiful I don't think he matches the style.
Shinkai makes the same movie every time[1], but for his last one he actually wanted to make a yuri movie and the producers made him instead do the same movie over again, which is why the boyfriend gets turned into a chair and it becomes a women's road trip for some of it.
[1] incel guy meets a girl once, he can never see her again because she's on another planet/in a coma/in the past/in Tochigi, he spends the rest of his life being sad about it even though they weren't in an actual relationship
All of the directors you mentioned rely heavily on CG effects and tons of digital layering for their films... there really is no other Studio Ghibli at the moment for feature animation.
There are some French films that over the years have had that touch, but they often lack the narrative component which make Ghibli films magical.
It's no secret that 2d animation is very expensive and taxing, and if you make failed movies you risk a studio like Ghibli.
Both Yasuhiro Yoshiura and Mamoru hosoda come to mind as directors that could direct films like that if required, but I don't know how consistent they would be if directing constant movies like it.
Regarding Makoto Shinkai I think his movies are a bit too sadistic, or at least his mentality to be do Ghibli films, directing tragic/NTR movies when he was happily married to an audience of mostly shutins always came to me a bit sadistic, even though his movies are visually beautiful I don't think he matches the style.