If Barcelona get to play against teams like Madrid with what I'm seeing I think they won't survive Real Madrid, if they can't beat Osasuna then it will be hard for them this season.
Things can change from one game to the next. Barcelona wasn't very good in this match because I didn't see them playing calmly, but I believe El Clasico is a very different match. I can expect Barcelona to be able to beat Real Madrid this season even though Real Madrid has been in top form so far, but that could change for many reasons.
I'm just worried if some of Barcelona's important players get injured, that would obviously be very disturbing. After all, Barcelona have gained additional strength in defense where they managed to bring in Cancelo, they also have Joao Felix, both of whom can be expected to contribute to better gameplay. In the end I'm not too worried about Barcelona, at least not now.