well the story probably wouldn't continue to the point of narutos death. it would be between sasuke, shikamaru, and konohamaru depending what kind of ninja konohamaru became. shikamaru was the apprentice of the third hokages son and very intelligent and fit to be it. sasuke is fit for it as well plus the connections and his ability he can do the job.
then he would kill the entire village. Because naruto would have to be dead for sasuke to be the hokage, and if naruto is dead noone can stop sasuke from exacting his revenge.