I think it'd be cool to end with itachi and becoming chuunin. Then make a new series where they are chuunin. Then another at Jounin, and then an Origins OVA about the 1st and 2nd hokages and the starting of konoha, and another OVA about naruto's grandson and him trying to live up to naruto's legacy, where he really surpases it, and is as strong as naruto is now at konohamaru's age...