Well there are over 7 leagues games left to play and it is too early to say that Barcelona are out of the title race in the la Liga, because in football; nothing is impossible. The question should be after Barcelona win to advance to the champions league quarter finals, can they mount a late league challenge
If we talk about possibilities, it really doesn't need to be said now because there are still several matches that all teams have to play, but are you sure that Real Madrid will lose in a row in the next 7 or 8 matches this season? I'm not really sure about that because the quality of Barcelona's players this season is actually not that good and there are still many shortcomings that Xavi needs to fix. Winning in the Champions League when hosting a bad team like Napoli is a very normal thing in my opinion because I am not sure Barcelona can last long in the Champions League this season.