We may get a benefit next year if the Wenger era finally comes to an end. I think Alexis and Ozil may leave, maybe not both or one of them to us, but they may free up a player that we could poach. I don't see Özil returning to spain, with Barcelona most probably getting one of Pogba (hope not) or Gundogan, and the final inclusion of Arda. Madrid is stacked at Midfield, with a lot of young talent.
Maybe he will go to Bayern, and that would free Götze, or if he goes to PSG, he would allow Pastore to move on. Of course all of this is hypotetical, but you get the idea.
Of course, another possible target I could see moving on next summer, would be Coutinho. There could be really good opportunities that we could get advantage of.