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.