Wow, I wasn't expecting that. (I have an AI on my phone that speaks to me, and I set Morning Musume as a keyword a long time ago and it just starting talking and saying "It seems like Kudou Haruka is graduating). I thought I'd misheard until I hopped on here.
The actress thing is less surprising and actually, since she's decided to do this younger rather than older, I'd guess that she's planning to try and get into TV rather than stage plays. More like a Mano than a Maasa.
10th Gen breaking up is an interesting feeling. One one hand it feels right to have the older gens not "whole" it really hammers in that they're the true seniors now in the group, but as they were such a tight nit group it's also really sad.