They should really do an anime only arc where their genders are reversed. I can see it now.
Haruhi wants to enter the rugby team but the team captain refuses telling her that it's a man's game. Haruhi then realizes that there are many things that me a man can do that a woman can't. She spends the remainder of the day brooding. Next morning as kyon wakes up he finds out that he's a chick. His mom is a dad and he now has a younger brother as opposed to his little sister. He shits bricks and runs to school to find everybody's gender has switched.
Only ones aware of this change are the SOS members. They now have to convince haruhi who is a dashing young lad that being a woman is better than a man a whole series of events transpire, the return of asakura as a knife wielding bishie who dies protecting yuki, haurhi and kyon from a sect of time travels that believe the only way to sop the time anomaly is to kill haruhi.
We also get to see others of koizumi's sect and various other data creatures. Fourteen good episodes and millions of doujin and hentai out of this arc.