Nakazawa graduated Morning Musume when she was 28 iirc, i'm still hoping against hope that Sayu would break that record
If anyone could pull that off these days it'll be Sayu (in character with her narcissistic tv persona too
)... and by then Fukuhime or anyone else could handle being leader with more than 5years of experience in the group.
I'm aware that changes and growth are kind of the theme for MM, but that doesn't mean we can't have a period of stability and prosperity with the current line-up for another 1-2years. I just hope the upper level guys in UF thinks so too instead of pointlessly trying to fill up some arbitrary quota of graduations/auditions every year