From what I gather reading around,
Final Chapter will not involve Ōarai closing or MEXT backing down on their word. Also, it looks like Hana, Saori and Yukari are
a part of the student council in
Final Chapter. Saori is in a secretary role, probably in Momo's role, while Hana has become the president, in place of Anzu. While not shown, I'm betting that Yukari is the president.