The opportunity to play in the UEFA Champions League next season is still wide open for Barcelona, but that's how they can take advantage of every game in La Liga. There is still plenty of time to improve their performance. I'm sure they'll be able to get out of what they're going through now.
Apart from that I agree with your opinion, they are only a few points behind, it is not impossible with 1 or 2 games they can improve their position in the standings.
In general, everyone always takes into account the Champions League in a football club because it is a big event that is often inhabited by big clubs too, so it will be very painful if a football club that used to be strong but for now is not included in the realm of the Champions League even though Barcelona is also a big club in the arena of football.