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Yes, that's why, Atletico Madrid who are 7 points behind, Real Madrid who are usually the favorites to win La Liga now seem very difficult to win La Liga because of their failure against Valencia which resulted in the points gap with Barcelona getting further away, which is now 4 points. So, for this season, the possibility of Barcelona becoming La Liga champions can be confirmed more than 60%, unless in the remaining matches, Barcelona experiences failure and error that continues for 3 matches. But it seems that will not happen.]
Barcelona have been the favorites to win the La Liga title this season since the beginning of the season, even I am not sure Real Madrid will win it after they won it last season. Real Madrid do not have a record of winning two titles in a row in the last decade, so their chances are very low even though some of their fans are very optimistic. But the chance is always there for Real Madrid and I believe it is never impossible, but considering the points gap that already exists, Barcelona's chances are certainly higher.
There are some tough games for both teams at the end of this season and that will determine who wins the title. We also do not know if Barcelona and Real Madrid will drop points again in the next games, sometimes they also lose when they are favorites. But the El Clasico match might decide their fate and journey this season, let's just wait and see.