You don't need closure.
Never kill your best villian.
Just look at Dr Who, you always let 1 Dalek sneak out the back door.
The Joker always get arrested and is sent to Arkham asylum, because he is insane. He stays in the asylum for however long he thinks is funny, then he escapes, a few films later, they can have someone else do the Joker, he will be a bit different, but ppl change over time, so it would be ok if they do it well.
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