Wow! You really thought this through!
Personally I would love to see a Super pack, but the focus for me would be more like the mutants from x-men or the the Incredibles, where the focus is more on sims with superpowers just trying to live their lives.
The crime fighting angle would be harder to incorporate into the Sims 4 style. But I would love to see a crime fighting career added, then aliens and vampires could also get in on the action.
Another idea would be to incorporate Supers into a dystopian future like pack where the heroes are using their powers to fend off zombies or something. Talk about a niche pack, but I can see it as their last wacky, just-for-fun pack at the end of the Sims 4.
