there are versions of darkseid i would say could take down wf. the current version isn't one of them, clearly. we also don't really know yet how much 'weaker' wf is since he altered his form. if he is weaker. i'd think wf could survive the OE, maybe, but he'd be badly injured by them. he has died though, so clearly he isn't invincible. i had the sense he'd died more than once when mxy was talking, so in some of his higher showings, it's not impossible imo that the OE could possibly end wf. impossible to say really though given wf's lack of any real combat feats.