I don't think, Arsenal performance will going to be worse next season, because we saw what they displayed in this season to ended up in second position, because their manager set a good plan for the team to achieve what they achieved in this season. You can see that new manager is about to take over from Liverpool manager and Chelsea too has replace their manager which is a sign that Arsenal will going to embrace a good opportunity to maintain that second position in the premier league competition. Don't forget that is not about the funds you use to sign players that will determine Newcastle united winning, because Manchester city still look like the team that will win this title again next season, because their players are still ready to do what they have never do before in any competitions.
Every sane football fan know that Arsenal has tremendously improved in terms of their performance in overall competition. I do blame them most often for giving away the league title to Manchester city but that doesn't overrule the fact that their performance has been very impressive throughout the season. Taking a look at how and where Arsenal was five to six years back and where they are now, they deserve nothing but commendation. I strongly believe that they are going to be greater this coming season than they ended this season. Mistakes happen in order to show the errors and lapse and how you can improve in the erring areas, Arterta has witnessed these mistakes for two consecutive seasons and now is the right time to make correction. Manchester city are indeed a formidable team in English premier league but there's an end of era some day, perhaps the era is getting close.