Even possibly today this act could have repurcussions. After all, all those lives taken. It be utterly horrific if a ton of Black Rings came upon Coast City. No doubt the city be of the dead once again and not of hope. But nah.. Geoff Johns wouldn't do such a thing.. would he?
Looking at that blast, I don't think there would be any bodies for the rings to find. Not like that wouldn't stop GJ if he thought it was a really keen idea, though.