Well, to be fair most of the fujoshi part was madarame harem + Hato's crossdressing.
I agree that the fujoshi cast still had some potential. Hato + Yajima + the Yoshitakes with Sue would be a fun read as well.
They would just need to recruit one or two guy otaku, best if one of them (or the only one) would be very normal instead of quirky like the Yoshitakes, Hato and Sue.
I'd love to see a tokusatsu otaku there as well as an idol one. Those seem to be people that wouldn't find a club on their own and would be right for the Genshiken.
I'm happy to see a non-Hato ending, because that would be against the character Madarame was and also happy about a non-Saki ending. We already have that in the Spotted flower AU done very well, so while this kind of ending is still possible, due to Spotted being further in the future, I'd prefer to see two different timelines with different routes. More stories from Genshiken.
Kio Shimoku is good. I just think he gave too much time for the harem which was a cheap shot at pandering to the otaku and also too much time for the Hato drama which alienated some people that didn't care about it.
I think his idea of changing the genshiken to a fujoshi circle to change the perspective was good, but it lacked a strong male point of view, since Kuchiki was a joke character.
Then he started loosing people and did the trap and harem stuffs, which took the space for the female Genshiken just being the Genshiken.