Compared to teams like Real Madrid and Machester City, Barcelona got fewer investments and we can't expect to see them spending huge amounts of money and buying superstar players for the Champions League, but still, they have Xavi coaching the team and this can be an advantage for them. I think Barcelona can still have a chance to win the title in the next Champions League.
Of course Barcelona have a chance to win the Champions League title although Xavi cannot expect so much money to be poured into building a better squad. Barcelona have tried to do the best they can in managing finances and balancing them due to bad conditions, but they are still a quality team that can give the best match.
Barcelona has a lot of talented young players combined with some experienced old players. Even though Alba and Busquets have left, I think Xavi still has quality replacements to keep their chances in various competitions. I know the Champions League is tough, but there's nothing wrong with expecting Barcelona to be one of the strong contenders next season.