Arteta's undoing will be his hubris. He'll never be a great coach with this sort of behaviour and clearly he won't be remembered for plenty silverware either.
I still think we need to give him an ultimatum, its 5 years now and all we have is one unexpected FA cup triumph. He seems to be one of those kind of people that you need constantly put pressure on to get results that you want from them.
Its been tiny margins with him for too long, we can't allow this to continue unabated with the kind of talent we are lucky to have right now.