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.
Maybe the position between first and second place will not be much different. Manchester City could indeed retain the championship title again next season. Or Arsenal will be the one who succeeds in winning the title next season. But for Liverpool and other teams that have just had new coaches, I think it will be quite difficult for them to enter the title competition with Arsenal and Manchester City. Arsenal will definitely be able to maintain the quality of their performance. because Arteta has proven to be able to keep Arsenal in second place for two seasons. And even this season and last season we saw Arsenal's development become much better. And it is not impossible that Arsenal next season will be much stronger than this season. So that fiercer competition with Manchester City will occur again.