I think, as long as Xavi is still the coach of Barcelona, then it looks like Barcelona doesn't have a big chance to win the Champions League trophy. After all, in the last two seasons, in the end, Barcelona could not qualify for the last 16 in the Champions League, and Barcelona then only played in the Europa League, but Barcelona still failed. So yes, I personally feel that Xavi cannot make better developments, but if only to dominate La Liga, then Xavi still has good ability to keep Barcelona good only in La Liga.
Barcelona's success in winning the La Liga title this season has made Xavi Hernandez's position still safe as a coach, after Barcelona failed in the Champions League group stage and were eliminated in the Europa League playoffs. No doubt with Barcelona has very poor performance in Champion League last two season, not qualify in group stage after difficult winning against Inter and Bayern made Barcelona failed to 16th round and bad achievement for the first participants have failed with group stage.
Next season I don't sure with Barcelona can't compete in Champion League, has good capital as La Liga winner not guarantee Barcelona have chance for qualifying at group stage exactly when drawing have bigger teams face.