Because I see Xavi is a genius future coach and those who say Xavi has to go, they don't know his game. They only criticize things they don't even know about, when Xavi needs the best defensive midfielder he knows what he is talking about and this is just the start, barcelona just needs to bring in the players he wants and be patient in the process because what he is doing right now is not perfect . But now he has decided to leave Barcelona and this decision will not change even if Barcelona wins the UCL title. Xavi's decision to leave Barcelona is final and will not change.
Now it's a little more complicated because seeing Barcelona's previous condition and the pressure continued to be given to Xavi makes him give up now and let whoever will coach Barcelona next season which of course this could backfire again for Barcelona for wasting Xavi who has been very instrumental in lifting Barcelona's performance even to get the trophy back in very difficult conditions.
Now with the previous unchanged statement for Xavi, it is very small for them to be able to keep Xavi even though Laporta is still trying to keep Xavi now but the decision is currently in Xavi's hands and he can leave next season because of the lack of appreciation given by Barcelona to him.
This is obviously very regrettable but there is nothing that can be done at this time because the chance of Xavi changing his decision again is still there but the possibility of Xavi leaving is inevitable for now.