Why, for the first time in a decade Arsenal has investing huge sums into team building, Arteta is signing the players he wants, and they are performing, it's quite clear Arsenal want to compete again at the top.In my opinion Arsenal won't sustain what they have done in half a season over a managers 3-5 year contract , we have the infrastructure for him to build a legacy of trophies over that time frame. That being said I think that Pep also realises that and will likely stay for some time yet.