In my opinion, Xavi's job was good to bring Barcelona to finish in the 2nd standings, it means that things are getting better for now, so the final match with Villarreal even if they lose will still be good for Xavi.
Barcelona with Xavi is not a bad one the young man have shown and done a great job for FCB this season, ending the league at 2nd position is not a bad one for him. With his performance this season we are looking more up him next season whether he would be able to lift the Laliga next season.
With all the problems that Barcelona at that time facing when Xavi took over the club from Koeman, of course ending the season in second place in La Liga is an extraordinary thing for Barcelona, if Koeman was still coaching Barcelona at this time I think even Barcelona would be outside the top 10 right now, but they were lucky enough when they were down and Xavi come to be a hero who was able to make them rise to what they are today.