Arsenal is a very good team and I agree with you that they will be able to have an excellent run in the champion league considering the fact that they have made some excellent signings and above all Jorginho has signed the renewal of his contract with Arsenal which personally is a a player who I like very much even if he didn't shine in these European games with Italy but he will have time to make up for it on the big stages
I also see Arsenal as a team that can still be quite strong next season so that some of their closest rivals last season also still have to be wary of Arsenal as their competitor in the race for the Premier League trophy. Likewise in the Champions League because Arsenal could perform better next season and be able to reach a quite crucial stage so that their rivals will still see Arsenal as an opponent that needs to be eliminated early before heading to the quite crucial stages in the Champions League.
For the past two seasons now, Arsenal has been very much in good form and playing good football. But it will be quite funny if Arsenal we have a three consecutive excellent season without any trophy to their name. This guy is were supposed to win the English Premier League title season before last and they were also supposed to win same last season. They also had the opportunity to win the Europa League season before last about all did not work. I also do not believe that they will make it work this time around if they continue with the strategy they have been using.
It is high time Arteta and his boys focused on one title or trophy and win for the club. If they think that Champions league is difficult, they should behave like Sevilla and focus on Europa. If they feel that EPL is difficult they should focus on FA cup. I no longer like this trophyless seasons for Arsenal.