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
Well, Xavi ranks amongst good coaches in europe today; but he does not rank as one of the most successful coaches in europe; and if Barcelona sack the dude today' they will face little difficulty replacing him.
The problem with Barcelona this season has to do with players depth, injury profiles and poor investment in the squad. No coach can fix such deficit.
Better for Barcelona board to trust the process with Xavi