Do you think there should be a sequel?
I'm not sure, I think both options would kinda be bad.
If there is a sequel, it could ruin the purpose of this movie, and make it feel like just the first part of a typical action series.
If there isn't a sequel, it could prove what some people have been saying, that this story could've easily been done without the Gotham setting, and that the Gotham setting was just a pointless way to make this movie more popular.