I can actually see Markov's death sticking in this case, as well as the First disappearing once everything is over. A fresh, new start with Laxus as guildmaster (you know it will happen) and everyone returning to their old crazy ways. It'll be like a reset.
Still kind of weirded out that Mashima actually had Zeref and Mavis have a kid. I mean, we knew they'd fallen in love, but to actually show they had sex... huh. It just surprised me, I guess.