In my opinion Xavi is not really a terrible coach because with what he achieved at Barcelona despite managing a team that is financially struggling he was still able to lift the La Liga trophy. I also don’t want him at Chelsea but imagine what he would be able to achieve with a team that is financially stable. So with that i think Xavi will go to become a good coach in future.
The future of Barcelona is in the hands of the president, Joan Laporta. He's one of the top pillars of the club but his management doesn't seem to be promising as expected, watching Barcelona decline and this have been really one of the unnecessary run for the club. Xavi Hernandez is no terrible coach because he lifted Barcelona from ruins when he got appointed as headcoach. He's this type of manager that would give more opportunities for the young talents because he have strong beliefs in their positive growth.