Lando definitely has a huge backstory to tap into.
Maz as well.
Is this the end of the sith? I doubt that. Thereís always a new megalomaniac lunatic thirsting for power and dominion.
There will be someone who follows Sidious or plageuis who comes forward in the future.
...hereís a thought though. How about storm troopers or sith troopers actually being deadly and killing 1/3 to 1/2 of the heroes? That would make them infinitely more intimidating and frightening. As it stands now theyíre just a half step up from the dumb droid army in phantom menace.