The whole thing sounded like deliberate rage bait anyway. It also did nothing to address the copyright issue since none of the things listed address...
I think a lot of it also has to do with the secret identities. They don't just own Superman and Batman, they own Clark Kent and Bruce Wayne. And this...
The only way I see that working, if this is really about copyright, is to change the secret identities. Clark Kent and Bruce Wayne are the identities...