There's no need, the war between Alvaraz and Fairy Tail ended a year ago, in Fairy Tail's favor. Acnologia is finally dead as well. All known God Slayers are allied with Fairy Tail, and the one Devil Slayer I know of- not that he's much of a Slayer, really- is a member of the guild itself. The only pressing concern currently is the Hundred Years Quest Wendy and her team will be going on pending her return.