For JLA: Act of God, it was bad enough when Wonder Woman was so distraught over the loss of her powers that she contemplates suicide. It gets even worse when you see the ending and realize Diana was pregnant at the time. Even Linkara missed this until a viewer pointed it out, and his reaction was pure Fridge Horror.
If Kyle's Lantern Ring was permanently shut down, what happened to active lanterns in the vacuum of space and on duty?
At the time Kyle was the only Green Lantern period, so that wasn't an issue.
Or hell, what about the Atlanteans who were outside the city? Did they get mulched into paste?
Considering Arthur was half-human, the other Atlanteans could still be safe.
And the other non-humans? Since the Martian Manhunter, Superman and Starfire all lost abilities that are natural to their species, I wouldn't be too sure about that...
Think about it, with no superpowered heroes, or anyone using anything more technologically sophisticated than melee weapons, next time a cosmic power like Darkseid or an alien invasion comes along, all that's going to be standing in their way are a handful people who know karate, who, unless Doug Monech is writing, are going to die in about five seconds, assuming the bad guy even bothers to deal with them.
Maybe not in Darkseid's case if the blacklight event wasn't limited to Earth. Maybe Darkseid never invaded because he lost his powers as well.
How does this even work? Shouldn't Diana cease to be? Same with anything Magitek or based on it? Isn't the ability for the aliens to exist on earth itself a power?
Whatever happens to Superman's Fortress of Solitude? I mean, isn't it superior to the Bat Cave in terms of technology, kryptonians being thousands of years more advanced than humans and Jor-El being one of the most brilliant scientists on Krypton? Couldn't Supes use it to still help humanity?