Hey guys this may be Wengers game plan. Wenger probably figured that the last two league champions i.e Leicester and Chelsea (lets face it chelsea will win the league) didn't play in the champions league. So he decides not to qualify so he can win the league next season. "Genius".
I think this season will be the last season for Wenger in Emirates, or maybe one more season for next season. I think this season is the worst season for Arsenal in few years. So many news says that their players are not comfort to stay in Arsenal, Like Sanchez and Perez. If the Wenger get one more chance, it would be one more year in Emirates.