So far, Xavi is one of the most successful coaches in my opinion. Barcelona doesn't need to act rashly by sacking him and finding a replacement coach for him, that just increases the pressure internally on the club. Barcelona must respect Xavi and give him full trust this season, even when the club is still hit by a crisis.
I think whoever the coach is, Barcelona has the possibility of going down because of the depth of their squad, but this seems to be ignored by some of the mainstream media. Xavi is yet to miss opportunities in La Liga, the Copa Del Rey and the Champions League, so the management and fans will have to be patient about his work.
But how is he one of the most successful coaches? I don't take into account his titles in Qatar here as this can really not be compared to anything coaches win in European leagues. It would be a joke to argue that because of those titles he is one of the best. It is now his third year in Barcelona and he won La Liga once and the Super Coppa once. Barcelona got eliminated as third in the Champions League group stage last year and then got eliminated from the Europa League. Maybe you can provide some info as to why you think he is one of the most successful coaches. Compared to which other coach?