Well we know that evil wins at the end of this film cycle. Darth Vader and the Empire rule at the beginning of the whole series (1977).
Would be interesting to hear what the story arc was at one time for the final trilogy (things did not remain calm, obviously).
There are books on how the final episodes ran (VII-IX). The big concept is that even though the evil emperor was killed, the entire imperial nation was not defeated. Democracy did not come. Luke restarts the Jedi Academy. The evil that the evil emperor held back is released (as well as many of his students). Its not as dramatic as episodes IV-VI.