Arsenal will not change easily because it is like a mentality something. This mentality was planted in them by Arsenal Wenger. So, they'll continue to follow it until they are tired of it.
Arsenal Wenger was not just only a coach, he was even part of the management team if I am not mistaken. So, he had alot of authorities to do many things.
He was more of a business type of manager, which is why he doesn't spend much on players.
I want to believe you will be wrong in the end. Arsenal are a different club since Mikel Arteta and the club has always been ready to back Arteta through with transfers which is a good thing and this summer the club will back him even further you will see. Arsenal will sign a striker and boost their attack for the coming season.