To date there have been numerous Sin City series, graphic novels, and one-shots, which are collected in seven different books.
A Western would be a departure, but a very logical one.
Then the question becomes whether Miller would then want to turn it into a third Sin City film with Robert Rodriguez. But that’s getting a little ahead of things.
There’s already a Sin City television show in the works, and if franchise creator Frank Miller gets his way, the exploits of the comic book and film world’s seediest, green-screeniest noir metropolis will expand even further in the near future.