Arsenal must keep moving forwards or risk what has been a terrific campaign becoming a flash in the pan.
Manchester City, who overhauled them to win another Premier League title, will not be any weaker next season.
Manchester United are potentially a world class striker away from challenging, while cash-rich Newcastle's trajectory is only upwards. Chelsea and Liverpool surely won't be as bad again.
So Mikel Arteta can't afford to stand still, even though the Gunners have produced some of their best football in two decades in recent months.