Barcelona was in a terrible state before tht arrival of Xavi. And he is just trying his possible best to put Barca back on track. But, what people don't understand is that this will take some time. Atletico Madrid performance are poor, they lost all their last 4 matches, and one of the problem Atletico seems to have is are defense. However, If Barcelona play their next matches without losing, they will surely take over Atletico Madrid's place.
Maybe in the short term it's difficult. Relying on players from the academy could not guarantee they would be successful. There are a lot of problems at Barcelona so this has an impact on their achievements.
Maybe if for the long term they can be successful again. Attempts to sign Xavi also can not be hopeful, because he is limited by the crisis to choose new players. Xavi is currently only maximizing what Barcelona have.
Xavi was a celebrity as a player at Barcelona. Then definitely one of the best midfielders in the world along with Iniesta on that team. Doesn't he just have too little coaching experience? Easy to say, but an experienced coach will not be happy to manage Barcelona at the moment. Xavi seems to be the best option at the moment. They do have potential, but all the puzzle pieces have to fit together well with these players.