Well as I said, Barcelona can't give up La Liga, otherwise if they don't win Xavi is in serious trouble
Real Madrid has other problems, it's better to advance in the Champions League if money from sponsors and television rights enters, simple logical calculation
But I think it doesn't matter even if Barcelona could win the title in La Liga with Xavi this season Because they had lost many players and they couldn't buy expensive players because of the financial problems they had in the other hand their coach, Xavi is not experienced enough comparing to his competitor in real Madrid, However, they nearly won the title on this season and there nothing to worry about Barcelona.
Now, there is no doubt about this Barcelona is the winner of La Liga and with this most chances they are not going to by any new player specially expensive due to their financial issues as right now their debut is more than $1.3 Billion which needs better management from them for having some better things in future.
Xavi is doing his job absolutely right and there is no problem about him and his job in coming years specially after winning La Liga in this season even their start was not good and things were not favorable for them as well but right now he's done amazing job and now have best winning unit which can give them better results in coming season as well but due to financial issues they are going to offload few players which have huge salaries this can create some trouble for them, but hopefully they will be able to settle this all successfully.