The discussion about results aside, strictly from seeing the team's style this season, apart from Pep ball that is untouchable aesthetically for me, Flick is the best I've seen from Barca managers. In this sense, any discussion about replacing him is a non-possibility until the motivation in the team irremediably declines.
Be a huge shame if he can't make it deliver big titles. To make it effective also, not only pleasing to the eye is the biggest challenge of the club. For Flick first and foremost, but also for the club in terms of upgrading the squad, and for the players themselves to not let their manager down individually.