~Snip
I don't know why you just concluded that Arsenal can't win the Champions League next season. I can also say Arsenal can win the Champions League next season. But if we were to mention the five teams that are favorites to win next season’s Champions League, I believe that Arsenal will be included in the list with their current performance. Arsenal is not a weak team that we can just conclude now that they can't achieve such a trophy. With the way Arsenal is beating their opponents currently, it is very possible they could fight for the Champions League next season.
I will not ignore Arsenal's potential in the Champions League next season, it's just that you have to admit that Arsenal's probability is no better than Real Madrid, Manchester City, Bayern Munich and several other top teams. Arsenal don't have a strong mentality when competing in the European arena like the Champions League, so I don't expect them to jump too high next season.
It's up to you how you convince yourself about Arsenal in the Champions League, I don't think Arsenal is mature enough to win it. On the other hand, I think Manchester City will be enthusiastic again next season in the race for the Champions League title besides Real Madrid, so I will put Arsenal in 5th or 6th position on the favorites list.
Based from what we have seen regarding their performance, Arsenal is not yet ready to beat the teams in the Champions League. But of course, the chance of going into this League is always there. We may not know their actual capabilities up until they show it game after game. For now, Premier League is more possible to win for this team and they can have very good standing on this League as compared to the Champions League.