This time it is different for Barcelona. The Europa League is going to be very important for them because of their financial condition. They have made many signings and there is even a situation for them like they might not be able to sign new players in January.
Considering this fact, they need to make as much money as possible this season. Maybe they didn't play much good in the Champions League. But I still think that they will fight for the Europa League title. Their priority is of course the La Liga title but I don't expect Xavi to focus on only that. Winning both championships would be awesome for them.
To be honest though i would be pretty happy if FC Barcelona would be eliminated by Manchester United in the next round right away. If the club officials of Barca are so stupid to spend that much money on new players, that they have basically spent the money that you get from reaching the knockout stage of the Champions League, then this is definitely their own fault. Before this season i was already surprised and shocked how much money Barca was spending on new players, given the fact that they have 1,3 Billion of debts and that they had to sell a lot of club property in order to not go bankrupt. They are just action completely irresponsible with their finances.