User blog comment:Miskos3/Fairy Tail 530: Neo Eclipse, Review/@comment-67.5.130.210-20170408234306

Even if Zeref succeeds in his reset button plan and prevents Natsu from dieing thus not getting cursed and somehow stops acnologia from being what he becomes is good and all for the short term.

The long term is that he's only solving one part of the problem (acnologia) and is only delaying the other (the curse) because Anhkseram would still exist so unless they take care of him to otherwise someone else will just get curse eventually anyway.