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 is just an excuse if Wenger wants to win the Premier League next season. supposed to be a classy coach like Wenger do not have to sacrifice the team's achievements in the next season.