Also, there's basically no way that there wouldn't be absolutely humongous social repercussions for such an action, both those on the abandoned world and those that care about those abandoned.
I won't start an argument here, but I will point out that people on Earth Bet consider almost anything sacrificed to kill an Endbringer to be worth it. India got glassed: No one was
happy about that, but they accepted it because Smurf 'died' as well.
Everyone might just be all "Well, you didn't
intend to trap the bastard with us originally, but you took the chance when it came up... Can't
really blame you for it, but we'd rather it didn't happen again thanks."
I hope that Pantheon has been paying attention to their Zion-genocide-indicator; they're getting perilously close to a potential berserk button for him.
Just how aware are they that they're getting close? They know there's things he doesn't like, but all indicators have him floating around the world like an idiot.
I guess they could be double checking some things with Dinah every now and then. 'Chance the world ends in X years if we make portals to other earths?'
However, in canon they worked out the Labyrinth/Scrub combo during the Echidna arc, approximately 2 years before he had his hissy fit, so it
could be that entities prevent host species from getting to
other worlds, and are fine with them accessing (non-blocked off) parallel dimensions?