'By 2010 it was clear that it had failed and that we needed a new approach. At that point we saw the first real sign of fallibility.'
Keeping us in the top 4 for six of the years since 2010 is not 'failure'. Especially when you consider that this period included a runners up place, 3rd place finishes and a smattering of FA Cups. All from a club with significantly less resource than others.
Arsene will have my eternal respect for that. It's a pity that others don't share that sentiment.