There are still 20 more games to be played by Barcelona, so there is still a very big chance for Barcelona to enter the top 4 to be able to play
in the Champions League next season. But to be able to compete for the La Liga trophy this season is impossible for Barcelona, so indeed finishing
in the top 4 is a reasonable target for Barcelona to achieve this season.
Barcelona don't have more games than other clubs to play in La Liga. They have same total matches to play so it is not advantage for Barcelona.
In addition, if you are a strong team and can manage to win, more available matches to play mean more chances to collect more points. Oppositely, if you are a bad team, more available matches to play means more chances to lose more points and fall further behind other opponents. I believe Barcelona are facing with the second scenario.
Barcelona not get good opportunity right now and out from top four position make them not really happy situation right now, although match begin one week later they have get Ferran Torres from Manchester City and I think still not enough. Many other player want get by Xavi but financial make situation bad for Barcelona, still optimist with fans trusted Barcelona can back to position again? I think many possible for other club change position from Sevilla and Real Betis if keep consistent performance will make Barcelona out from champion league position next years.